on the alert for

on the alert for 基本解释

处于警报状态

词组短语

1、on the alert for sth 对某事保持警惕

on the alert for 用法和例句

1、on the alert (for something)

对某事警觉

2、They must be constantly on the alert for the enemy.

他们必须随时注意敌人。

3、They are always on the alert for traffic signals.

他们总是很留心交通信号。

4、bird watchers on the alert for a rare species

密切注意稀有鸟类的鸟类观察家

5、Drivers must be on the alert for traffic signals.

驾驶员必须密切注意交通信号。

6、Her fears had always been on the alert for an upheaval.

她日夜提心吊胆, 严防突变。

7、The policemen were on the alert for an excaped convict.

一名逃脱犯令警方全面警戒。

8、She was always on the alert for some new calamities.

她总是保持警觉以防某种新的灾难。

9、Police are warning the public be on the alert for suspicious packages.

警方警告公众要警惕可疑包裹。

10、They want to be on the alert for similar buying opportunities.

他们希望随时掌握有关类似购买机会的信息。

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