EN： The sentence begins with a nominal relative clause (also called a free relative clause) introduced by 'What'. Here, 'What' functions as 'the thing(s) that', acting as the subject of the entire title/sentence. It is a common way to introduce a topic or highlight essential information.
中文： 句子开头是由「What」引导的名词性关系从句（也称为自由关系从句）。在这里，「What」相当于「the thing(s) that」（……的事情），作为整个标题/句子的主语。这是一种常用来引入主题或强调重要信息的结构。
What you need to bring is a valid ID.
你需要携带的是有效的身份证明文件。
EN： The preposition 'about' is used to indicate the subject matter or topic of the knowledge. It connects the verb phrase 'need to know' with the noun 'heatwaves' to specify what the knowledge is concerning.
中文： 介词「about」用于指出知识或信息的主题或范围。它将动词短语「need to know」（需要知道）与名词「heatwaves」（热浪）连接起来，以明确说明该知识所涉及的对象。
I want to learn more about climate change.
我想了解更多关于气候变化的资讯。
EN： The Present Perfect Tense (have/has + past participle) is used here ('have become', 'has changed') to describe actions or states that started in the past and have a direct connection or relevance to the present moment.
中文： 现在完成时（have/has + 过去分词）在此处（'have become'、'has changed'）用于描述在过去开始，且与现在有直接关联或影响的动作或状态。
Global temperatures have risen significantly over the last century.
在过去的一个世纪里，全球气温已显著上升。
EN： The conjunction 'as' is used to indicate that two trends or actions are happening at the same time, often showing a parallel development or a cause-and-effect relationship (meaning 'while' or 'because').
中文： 连词「as」在此处用于表示两个趋势或动作同时发生，通常展现出平行发展或因果关系（意为「随着」或「因为」）。
As the sun went down, the temperature began to drop.
随着太阳下山，气温开始下降。
EN： The verb 'call' can take a direct object followed by an object complement (Noun Phrase) to express 'to name or describe someone/something as a particular thing'. The structure is: call + Object + Object Complement.
中文： 动词「call」（称呼/视为）可以接直接宾语，后接宾语补足语（名词短语），用来表示「将某人/某物称作或描述为特定事物」。其结构为：call + 宾语 + 宾语补足语。
Many people call the lion the king of the jungle.
许多人将狮子称为丛林之王。
EN： The subordinating conjunction 'because' is used to introduce a subordinate clause of reason (adverbial clause of cause), explaining why the action in the main clause happens.
中文： 从属连词「because」（因为）用于引导原因状语从句，用以解释主句动作发生的原因。
She stayed at home because it was raining heavily.
她待在家里，因为雨下得很大。
EN： The term 'silent killer' is commonly used in medical and public health contexts to describe conditions or environmental factors (like high blood pressure, carbon monoxide, or extreme heat) that cause severe harm or death without obvious, immediate, or dramatic symptoms.
中文： 「silent killer」（無聲殺手）一詞常用於醫學和公共衛生領域，用來形容那些在沒有明顯、即時或劇烈症狀的情況下，卻能造成嚴重傷害或死亡的疾病或環境因素（如高血壓、一氧化碳或極端高溫）。
EN： The phrase 'An estimated' is used before a number or quantity to show that the figure is not exact but is a calculated approximation. It functions as an adjective modifying the noun phrase.
中文： 「An estimated」短语用于数量或数字之前，表示该数字并非精确值，而是估计的近似值。它在此处作为形容词，修饰后面的名词短语。
An estimated ten thousand people attended the outdoor concert.
估计有一万人参加了那场户外音乐会。
EN： The prepositional phrase 'die from' is used to specify the direct cause of death, such as a disease, hunger, or environmental factors (e.g., heat-related causes).
中文： 介词短语「die from」用于指出导致死亡的直接原因，例如疾病、饥饿或环境因素（如与高温相关的原因）。
Many wild animals die from lack of food during harsh winters.
在严酷的冬天里，许多野生动物死于食物匮乏。
EN： The phrase 'heat-related causes' reflects a growing public health and meteorological consensus. In many Western countries, deaths during heatwaves are often indirect (e.g., heart failure triggered by heat), so medical and environmental reports use 'heat-related' to capture the broader, systemic impact of extreme weather rather than just direct heatstroke.
中文： 「heat-related causes」（與高溫相關的原因）這個表達方式反映了當前公共衛生與氣象學界的共識。在許多西方國家，熱浪期間的死亡案例多屬間接性（例如高溫引發的心臟衰竭），因此醫學與環境報告會使用「與高溫相關」一詞，以納入極端氣候對人體系統造成的更廣泛影響，而非僅限於直接的中暑身亡。
EN： Comparative Adjectives (higher than): Used to compare two things, people, or quantities. For short adjectives, we add '-er' to the adjective and follow it with 'than'.
中文： 比较级形容词（higher than）：用于比较两个事物、人或数量。对于单音节或部分双音节的短形容词，我们在形容词词尾加上「-er」，后面接「than」表示「比…更…」。
The temperature today is higher than it was yesterday.
今天的温度比昨天还要高。
EN： Past Participle as Post-modifier (caused by): A past participle phrase can be placed directly after a noun to function as an adjective, describing or defining the noun. It has a passive meaning (equivalent to a shortened relative clause: 'which are caused by').
中文： 过去分词作后置定语（caused by）：过去分词短语可以直接放在名词后面，起到形容词的作用，用来修饰或限定该名词。它具有被动意义（相当于省略了的定语从句「which are caused by」）。
The damage caused by the storm was severe.
暴风雨所造成的损害非常严重。
EN： Passive Voice with 'be + past participle' (is listed): Used when the focus is on the action or the receiver of the action, rather than the doer. Here, 'heat' is the receiver of the action 'list'.
中文： 被动语态「be 动词 + 过去分词」（is listed）：当焦点在于动作本身或动作的承受者，而非执行者时使用。在此处，「高温」（heat）是「列出」（list）这个动作的承受者。
The results are published on the school website every month.
结果每个月都会公布在学校网站上。
EN： Adverbs of Frequency (rarely): Adverbs that describe how often something happens are typically placed before the main verb (listed) but after the auxiliary or 'be' verb (is).
中文： 频率副词（rarely）：描述事情发生频率的副词，通常放在一般动词（如 listed）之前，但要放在助动词或 be 动词（如 is）之后。
She is rarely late for her morning classes.
她早上的课很少迟到。
EN： The structure 'This is because...' is used to introduce a clause that explains the reason for something mentioned previously. 'Because' acts as a subordinating conjunction introducing an adverbial clause of reason.
中文： 「This is because...」（这是因为……）结构用于引导一个从句，以解释前文所述事情的原因。「because」在此作为从属连词，引导原因状语从句。
He missed the train. This is because he overslept.
他错过了火车。这是因为他睡过头了。
EN： The relative pronoun 'that' introduces a defining relative clause (adjective clause) modifying the noun phrase 'indirect killers'. The verb 'make' in this clause is followed by an object ('existing illnesses') and an object complement ('worse') to describe a change in state.
She bought a device that makes daily tasks easier.
她买了一台能让日常工作变得更轻松的设备。
EN： In public health and climate science discourse, the term 'indirect killer' is increasingly used to describe environmental factors like heatwaves. Unlike direct causes of death (such as accidents), heat-related deaths often manifest as heart or kidney failure, making the underlying climate factor less visible in official statistics.
中文： 在公共衛生和氣候科學的討論中，「indirect killer」（間接殺手）一詞越來越常用於描述像熱浪這樣的環境因素。與直接致死原因（如意外事故）不同，與高溫相關的死亡通常表現為心臟或腎臟衰竭，這使得官方統計數據中較難直接看出氣候因素的影響。
EN： The preposition 'from' is used after the verb 'die' to indicate the specific cause of death (e.g., a disease, hunger, or old age). This is a common collocated pattern: 'die from + cause'.
中文： 介词「from」常用于动词「die」之后，用来表示具体的死因（例如：疾病、饥饿或衰老）。这是一个常见的搭配模式：「die from + 死因」。
Many people in history died from the flu before modern medicine was developed.
在现代医学发展之前，历史上有许多人死于流感。
EN： The non-defining relative clause starting with ', which' is used to add extra, non-essential information about the preceding nouns ('diseases of the heart, lungs, or kidneys'). It is separated by a comma and uses 'which' as a relative pronoun.
中文： 以「, which」引导的非限制性定语从句，用于对前面的名词（「心脏、肺部或肾脏疾病」）补充额外的、非必要的说明。这种从句前面会加上逗号，并使用「which」作为关系代词。
He decided to avoid caffeine, which helped him sleep much better at night.
他决定避免摄入咖啡因，这帮助他在晚上睡得好多了。
EN： Apposition (Appositive Noun Phrase): An appositive is a noun or noun phrase that sits next to another noun to rename or describe it. In this sentence, 'a public health expert' is an appositive phrase that provides more information about 'Doctor Maria Santos'. It is set off by commas.
中文： 同位语（同位名词短语）：同位语是紧跟在另一个名词旁边，用来重新命名或描述该名词的名词或名词短语。在本句中，「a public health expert」（公共卫生专家）是一个同位语短语，用来提供关于「Doctor Maria Santos」（玛丽亚·桑托斯医生）的更多信息，前后以逗号隔开。
Mr. Chen, a high school teacher, loves reading history books.
陈先生是一位高中教师，他热爱阅读历史书籍。
EN： Noun Clause as Direct Object: A noun clause is a dependent clause that functions as a noun. Here, the clause 'that many people do not realize how dangerous a heatwave can be for their health' acts as the direct object of the reporting verb 'has said'. Within this, 'how dangerous a heatwave can be for their health' is an indirect question functioning as another noun clause (the object of 'realize').
中文： 名词性从句作为直接宾语：名词性从句是起名词作用的从属从句。在这里，从句「that many people do not realize how dangerous a heatwave can be for their health」作为引述动词「has said」的直接宾语。在此从句内部，「how dangerous a heatwave can be for their health」是一个间接疑问句，作为另一个名词性从句（动词「realize」的宾语）。
She believes that we should protect our environment.
她相信我们应该保护我们的环境。
EN： The collocation 'put stress on' means to place pressure or strain on someone or something. 'Stress' is an uncountable noun here, and it is often modified by adjectives like 'great' or 'severe'.
中文： 搭配「put stress on」意为「给…带来压力或负担」。在这里「stress」是不可数名词，常用「great」（极大的）或「severe」（严重的）等形容词来修饰。
The financial crisis put great stress on their marriage.
金融危机给他们的婚姻带来了极大的压力。
EN： The adverb 'especially' is used to single out one person, thing, or situation as being more important or fitting a description better than others. It is often followed by a prepositional phrase (e.g., 'on...').
中文： 副词「especially」（特别是、尤其是）用于强调某个人、事物或情况比其他更重要或更符合描述。后面经常接介词短语（例如「on...」）。
I love eating fresh fruit, especially in the summer.
我喜欢吃新鲜水果，特别是在夏天。
EN： The semi-modal verb 'have to' is used to express strong obligation or necessity imposed by external circumstances (in this case, the physical demand of rising temperatures). It is followed by the base form of the verb ('work').
中文： 半情态动词「have to」（必须）用于表示因外部环境或客观条件所产生的强烈义务或必要性（在此指因气温上升而带来的生理需求）。其后接动词原形（work）。
We have to leave early to catch the train.
我们必须提早出发才能赶上火车。
EN： The causative structure 'keep + object + adjective' (keep the body cool) is used to describe maintaining a person or thing in a specific state or condition.
中文： 使役结构「keep + 宾语 + 形容词」（keep the body cool）用于描述使某人或某物保持在特定的状态或情况中。
Please keep the door open to let some fresh air in.
请保持门敞开，好让新鲜空气进来。
EN： The relative clause starting with 'who' is used to modify the noun 'people'. 'Who' acts as the subject relative pronoun within the clause 'who already have chronic illnesses'.
中文： 以 'who' 开头的定语从句（形容词从句）用来修饰名词 'people'（人）。在从句 'who already have chronic illnesses' 中，'who' 担任主格关系代词的角色。
The teacher praised the students who finished their homework early.
老师表扬了那些提前完成作业的学生。
EN： The modal verb 'can' is used here to express possibility, indicating that the added strain has the potential to be fatal under certain conditions.
中文： 情态助动词 'can' 在此处用于表示“可能性”，指出在特定条件下，增加的负担“有可能”是致命的。
Extreme weather can cause severe damage to local infrastructure.
极端天气可能会对当地基础设施造成严重损害。
EN： The 'There + be' structure is used to state the existence of something. In this sentence, 'There are' is used because the subject 'secondary dangers' is plural. 'Also' is an adverb placed after the verb 'are' to add information.
中文： 「There + be」结构用于表示某物的存在。在本句中，因为主语「secondary dangers」（次要的危险）是复数，所以使用「There are」。「also」是一个副词，置于动词「are」之后，用于添加额外信息。
There are also many benefits to exercising regularly.
规律运动也有很多好处。
EN： Non-defining relative clauses are introduced by 'which' (preceded by a comma) to provide extra, non-essential information about the noun before them (in this case, 'secondary dangers').
中文： 非限制性定语从句由「which」（前面有逗号）引导，用来对前面的名词（在此为「secondary dangers」）提供额外的、非必要的补充说明。
He bought a new car, which cost him a lot of money.
他买了一辆新车，这花了他很多钱。
EN： The phrase 'put pressure on' is a common collocation meaning to place a burden, stress, or demand on someone or something. 'Extra' acts as an adjective modifying the noun 'pressure'.
中文： 短语「put pressure on」是一个常见的搭配，意思是给某人或某事施加负担、压力或要求。形容词「extra」（额外的）在此修饰名词「pressure」（压力）。
The upcoming exams put a lot of pressure on the students.
即将到来的考试给学生们带来了很大的压力。
EN： The modal verb 'can' is used here to express possibility, indicating that these problems have the potential to cause strain on the healthcare system.
中文： 情态动词「can」在此处用于表示「可能性」，指出这些问题有潜力或可能会对医疗系统造成压力。
Loud noises can cause permanent damage to your hearing.
噪音可能会对你的听力造成永久性损伤。
EN： The Present Perfect Tense ('have + past participle') is used here to describe an action that happened at an unspecified time in the past and has relevance to the present. The adverb 'also' is placed between the auxiliary verb 'have' and the main verb 'warned'.
中文： 现在完成时（have + 过去分词）在此处用于描述过去某个不确定时间发生、且与现在相关的动作。副词「also」（也）置于助动词「have」与主要动词「warned」之间。
Researchers have also found that exercise improves sleep quality.
研究人员也发现运动能改善睡眠质量。
EN： A noun clause starting with the conjunction 'that' functions as the direct object of the verb 'warned'. It contains a complete sentence structure (subject + verb + complement) that expresses the content of the warning.
中文： 由连词「that」引导的名词性从句，在此作为动词「warned」的直接宾语。该从句包含完整的句子结构（主语 + 动词 + 补语），用来表达警告的具体内容。
She warned that the roads would be icy after the storm.
她警告说暴风雨过后道路将会结冰。
EN： Adverbial Clause of Time introduced by 'When': This clause sets the condition or time frame under which the main action occurs. In this sentence, 'When days are too hot and nights do not cool down enough' acts as the time clause, modifying the main clause.
中文： 由 'When' 引导的时间状语从句：此从句设定了主要动作发生的条件或时间框架。在本句中，「When days are too hot and nights do not cool down enough」作为时间从句，修饰后面的主要从句。
When the rain stops, we will go for a walk in the park.
当雨停时，我们就去公园散步。
EN： Adverb 'enough' modifying a verb: The word 'enough' is used as an adverb meaning 'to the required degree'. When modifying a verb (like 'cool down'), it is placed after the verb or verb phrase.
中文： 修饰动词的副词 'enough'（足够地）：'enough' 在此用作副词，表示「达到所需的程度」。当它修饰动词（如 'cool down'）时，必须放在该动词或动词短语的后面。
He did not practice enough to win the competition.
他练习得不够，所以无法赢得比赛。
EN： The verb 'compound' is used as a transitive verb meaning to make something bad worse, or to intensify a negative situation. It is often followed by nouns like 'damage', 'problem', or 'difficulty'.
中文： 动词「compound」在此作为及物动词，意思是「使（坏事）加剧」或「恶化」某个负面情况。后面通常接「damage」（伤害）、「problem」（问题）或「difficulty」（困难）等名词。
The heavy rain compounded the traffic problems in the city.
大雨使城市的交通问题更加恶化。
EN： The relative clause 'that is done during extremely hot days' uses the relative pronoun 'that' as the subject of the passive voice verb 'is done'. This clause modifies the noun 'damage', describing what kind of damage is being referred to.
中文： 定语从句「that is done during extremely hot days」使用关系代词「that」作为被动语态动词「is done」的主语。此从句修饰名词「damage」（伤害），用以说明是指哪一种伤害。
The work that is done by volunteers is highly appreciated.
由志愿者所做的工作受到高度赞赏。
EN： The verb 'describe' is commonly used with the pattern 'describe A as B', which means to portray or define someone or something as having a particular character or identity. Here, 'A' is the object ('nights above 20 degrees Celsius') and 'B' is the object complement ('tropical nights').
中文： 动词「describe」（描述）常用于「describe A as B」的句型中，意思是将某人或某事描绘或定义为具有特定特征或身份。在此句中，「A」是宾语（摄氏 20 度以上的夜晚），而「B」是宾语补足语（热带夜）。
The guide described the historic building as a masterpiece of architecture.
导游将这栋历史建筑描述为建筑学上的杰作。
EN： The prepositional phrase 'above 20 degrees Celsius' acts as an adjective phrase modifying the noun 'nights'. 'Above' is used here to indicate a temperature higher than a specific limit.
中文： 介词短语「above 20 degrees Celsius」（摄氏 20 度以上）在此作为形容词短语，修饰名词「nights」（夜晚）。「above」在此用于表示高于特定限制的温度。
EN： The term 'tropical night' (Tropennacht in German, nuit tropicale in French) is an official meteorological term used in Europe to describe a night when the temperature does not fall below 20 degrees Celsius. Due to climate change, these nights are becoming increasingly common in temperate European regions, posing health risks as human bodies cannot cool down and recover from daytime heat.
中文： 「熱帶夜」（德語為 Tropennacht，法語為 nuit tropicale）是歐洲使用的一個官方氣象術語，用來描述夜間溫度不低於攝氏 20 度的現象。由於氣候變遷，這種夜晚在溫帶的歐洲地區變得越來越普遍，並對人體健康構成威脅，因為人體無法在夜間降溫並從白天的炎熱中恢復。
EN： The Present Perfect Tense (have/has + past participle) is used here to describe a state or action that started in the past and continues to have relevance or exist in the present. In this sentence, 'have become' indicates a gradual change that has occurred over time up to the present.
中文： 现在完成时（have/has + 过去分词）在此处用于描述一个从过去开始并持续影响或存在于现在的状态或动作。在本句中，「have become」（已变得）表示随着时间的推移直到现在所发生的渐进式变化。
Global temperatures have risen significantly over the past century.
在过去的一个世纪中，全球气温已显著上升。
EN： 'Because of' is a multi-word preposition used to introduce the reason for something. It must be followed by a noun, pronoun, or noun phrase (like 'climate change'), unlike 'because' which is a conjunction followed by a full clause (subject + verb).
中文： 「because of」是一个介词短语，用于引出某事的原因。其后必须接名词、代词或名词短语（例如「climate change」），这与后面必须接完整从句（主语 + 动词）的连词「because」不同。
The flight was delayed because of the heavy rain.
因为暴雨，航班延误了。
EN： In recent years, European meteorologists have increasingly focused on 'tropical nights' (nights where the temperature does not drop below 20°C) as a key indicator of climate change. These nights are culturally and socially significant because traditional European housing often lacks air conditioning, making warm nights a direct threat to public health.
中文： 近年來，歐洲氣象學家越來越關注「熱帶夜晚」（即夜間氣溫不低於攝氏 20 度的夜晚），並將其視為氣候變遷的重要指標。這些夜晚在文化和社會上具有重要意義，因為傳統的歐洲住宅通常缺乏空調設備，使得溫暖的夜晚對大眾健康構成直接威脅。
EN： The 'There + be' structure is used to indicate the existence of something. In this sentence, 'There are' is used because the subject 'several protection measures' is plural.
中文： 「There + be」句型用于表示某物的存在。在本句中，因为主语「several protection measures」（几项保护措施）是复数，所以使用「There are」。
There are many ways to solve this problem.
有很多方法可以解决这个问题。
EN： The relative pronoun 'that' introduces a defining relative clause ('that people can take...') modifying the noun phrase 'several protection measures'. In this clause, 'that' functions as the direct object of the verb 'take'.
中文： 关系代词「that」引导一个限定性定语从句（that people can take...），用来修饰名词短语「several protection measures」。在此从句中，「that」担任动词「take」的直接宾语。
These are the books that you ordered yesterday.
这些是你昨天订的书。
EN： The verb 'recommend' can be followed directly by a gerund (V-ing) to suggest an action. When multiple actions are recommended, they must be in parallel structure, meaning all actions should use the gerund form (drinking, staying, and wearing).
中文： 动词「recommend」（建议）后面可以直接接动名词（V-ing）来表示建议采取的行动。当同时建议多个行动时，必须使用平行结构，也就是所有行动都必须使用动名词形式（drinking、staying 和 wearing）。
The doctor recommends exercising daily and eating more vegetables.
医生建议每天运动并多吃蔬菜。
EN： Parallel structure (parallelism) is used to connect words, phrases, or clauses of equal grammatical rank. In this sentence, three gerund phrases are joined by commas and the coordinating conjunction 'and' (A, B, and C).
中文： 平行结构（排比）用于连接语法地位相同的单词、短语或从句。在本句中，三个动名词短语通过逗号和并列连词「and」连接在一起（A、B 和 C）。
She enjoys reading books, listening to music, and playing tennis.
她喜欢读书、听音乐和打网球。
EN： Apposition (同位語): A noun phrase placed next to another noun to identify or explain it. Here, 'a climate researcher' is an appositive that provides more information about 'Professor James Liu'. It is set off by commas.
中文： 同位语：放在另一个名词旁边，用以说明或解释该名词的名词短语。在此处，「a climate researcher」（一位气候研究员）是同位语，用来提供关于「詹姆斯·刘教授」的更多信息，前后以逗号隔开。
Mr. Chen, a high school teacher, loves reading books.
陈先生是一位高中教师，他热爱读书。
EN： Adverbial Clause of Purpose with 'so that' (表示目的的狀語從句): 'So that' is a conjunction used to introduce a clause expressing purpose or result, often followed by modal verbs like 'can', 'could', or 'may'.
中文： 使用 'so that' 的目的状语从句：'so that'（以便、为了）是用于引导表示目的或结果的从句的连词，后面通常会接 'can'、'could' 或 'may' 等情态动词。
She saves money so that she can buy a new laptop.
她存钱以便能买一台新笔记本电脑。
EN： In climate science and public health, 'vulnerable people' typically refers to the elderly, young children, outdoor workers, and individuals with pre-existing medical conditions (like heart or kidney disease) who are disproportionately affected by extreme weather events.
中文： 在氣候科學與公共衛生領域，「vulnerable people」（易受傷害的人群/脆弱族群）通常是指老年人、幼童、戶外工作者，以及患有慢性病（如心臟病或腎臟病）的人。他們在極端天氣事件中受到的影響往往最為嚴重。
EN： Present Perfect Passive Voice ('have been urged'): This structure is used to describe an action that started in the past and continues to have relevance now, with the focus on the receiver of the action (Governments) rather than the doer. It is formed by 'have/has + been + past participle'.
中文： 现在完成时被动语态（have been urged）：此结构用于描述从过去开始并持续对现在产生影响的动作，焦点在于动作的接受者（政府），而非执行者。其结构为「have/has + been + 过去分词」。
Local communities have been urged to prepare for the upcoming storm.
地方社区已被敦促为即将到来的暴风雨做准备。
EN： Infinitive of Purpose ('to reduce'): The 'to-infinitive' is used here to express purpose or intention, answering the question 'why'. It is a shortened form of 'in order to'.
中文： 不定式表示目的（to reduce）：此处使用「to + 动词原形」来表达目的或意图，回答「为什么」的问题。这是「in order to（为了……）」的简化形式。
She saved money to buy a new laptop.
她存钱是为了买一台新笔记本电脑。
EN： In recent years, 'heat action plans' have become a vital policy tool for municipal and national governments worldwide. These plans typically include early warning systems, opening public cooling centers, and adjusting outdoor work hours to protect vulnerable populations during extreme heatwaves.
中文： 近年來，「高溫應對計畫」已成為全球各地方與國家政府的重要政策工具。這些計畫通常包括早期預警系統、開放公共避暑中心，以及調整戶外工作時間，以在極端熱浪期間保護易受傷害的群體。
重要单词附有 IPA 发音、定义、例句和互动式测验。
在本文中： 估计的、大约的
在本文中： 间接的
在本文中： 慢性的、长期的
在本文中： 停电、断电
在本文中： 加重、使恶化
在本文中： 脆弱的、易受伤害的
在本文中： 致命的
在本文中： 压力、负担
片语包含类型标示、双语定义、用法说明和例句。
A disease or condition that causes death without showing obvious symptoms beforehand.
无形杀手、隐形杀手
Periods of time when the electricity supply to a particular area is interrupted.
停电
Nights when the temperature does not fall below 20 degrees Celsius.
热带夜（夜间最低气温不低于20或25度）
People who are easily harmed, influenced, or attacked, such as the elderly, children, or those with illnesses.
弱势群体、易受伤害的人群