on the alert
参考词典中on the alert的常规释义：
基本释义
- 保持警惕,处于戒备,提防着
参考例句
- The policemen were on the alert for an excaped convict.
一名逃脱犯令警方全面警戒。
- The policemen were on the alert for an excaped convict.
英英解释
1个形容词解释
- watchful and prepared for action
[同] on the alert, on the job
[例]- bird watchers on the alert for a rare species
- cops were on the job and caught them red-handed
点击查看……- watchful and prepared for action
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