Look: Mystery spheres on Australian beach identified as 'space balls
Listen to Course
0:00
0:00
Recommended Courses
Learner Reviews
Write a review
Key vocabulary words with IPA pronunciation, definitions, example sentences, and interactive quizzes.
Phrases with type tags, bilingual definitions, usage notes, and example sentences.
An organization of people whose job is to put out fires and help in other emergencies.
A container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.
Defunct human-made objects in space, such as old satellites and spent rocket stages.
The public organizations that respond to emergencies, typically including police, fire, and ambulance services.