VOA慢速英语:中国无人机帮助美国消防员完成他们的工作

drone – n. a kind of small air vehicle that flies without a pilot

leak – v. disclose information not previously known

data – n. information or facts about something

aware – adj. to know about something

isolate – v. separate someone or something from other people or things

confident – adj. very sure about your ability to do things well