on the alert against

on the alert against 基本解释

警惕

词组短语

1、on the alert against sth 警惕某事

on the alert against 用法和例句

1、Troops are on the alert against any possible aggression.

军队戒备着可能的来犯。

2、We were constantly on the alert against any surprise attack.

我们时时刻刻都在提防突然袭击。

重点词汇

alert a. 警觉的, 灵敏的, 留心的 n. 警报 vt. 使警觉, 通知, 使意识到

against prep. （表示态度）反对；（表示方位）紧靠着…；（表示对象）对…不利；以…兑换 conj. 在…之时；在…之前