英语词汇blue alert怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	blue alert
释义	blue alert (预备警报之后的)空袭警报(用于军事防御或民防) 台风警报[参较 red alert,white alert,yellow alert]
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