英语词汇空中警戒是什么意思，空中警戒的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	空中警戒
释义	DEFINITIVE EXAMPLES 权威例句〔certain〕To make extra certain, a police helicopter kept watch overhead.为确保万无一失, 一架警用直升机一直在空中警戒。外研社新世纪
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