英语词汇“blue alert”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	blue alert
释义	blue alert noun : the second stage of alert (as for a threatened air attack or an approaching storm) during which emergency preparations are carried out according to plan; also : the signal for this — compare red alert, white alert, yellow alert
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