on the alert 警惕着 ; 警惕 ; 警戒着
be on the alert for 警戒 ; 戒备
be on the alert 注意 ; 警戒 ; 警惕 ; 戒备
Battle Fortress on the alert 战斗要塞警戒之中
Keep on the alert 提防着点
be always on the alert 常备 ; 一种军事思想
not be on the alert 没有防备
put on the alert 处于戒备状态
to be on the alert 警惕
Always Be On The Alert 常备不懈
Police are warning the public to be on the alert for suspicious packages.
警方警告公众要警惕可疑包裹。
《牛津词典》
They want to be on the alert for similar buying opportunities.
他们要准备应对类似的购买机会。
《柯林斯英汉双解大词典》
They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击。
《新英汉大辞典》
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