alert

中文意思

• adj. 警觉的, 留心的
• n. 警戒, 警报
• v. 使警觉, 向…报警

英文释义

• n. condition of heightened watchfulness or preparation for action
• n. a warning serves to make you more alert to danger
• adj. engaged in or accustomed to close observation
• adj. quick and energetic

词形变化

过去分词

alerted

过去式

alerted

现在分词

alerting

第三人称单数

alerts

例句

1. adj. 警觉的, 留心的

   The security guard remained alert throughout his night shift to prevent any break-ins.

   保安在整个夜班期间都保持警觉，以防有人闯入。

2. n. 警戒, 警报

   The coastal city was put on high alert after the meteorologists issued a heavy storm warning.

   气象员发布强风暴预警后，这座沿海城市进入了高度警戒状态。

3. v. 使警觉, 向…报警

   A neighbor noticed the smoke and immediately alerted the fire department.

   一位邻居注意到了浓烟，并立刻向消防部门报警。