on the alert

on the alert 基本解释

警惕着, 防备着
[法] 戒备, 留意

词组短语

1、put sb on the alert 使某人保持警惕

2、on the alert against 警惕

3、on the alert against sth 警惕某事

4、on the alert for 处于警报状态

5、on the alert for sth 对某事保持警惕

6、on the alert to 对…保持警惕

7、on the alert to do 随时待命

on the alert 用法和例句

1、put on the alert

处于戒备状态

2、on the alert (for something)

对某事警觉

3、to be careful or on the alert

戒备提防或戒备

4、The enemy was on the alert.

敌人正在密切注意着。

5、The sentries were all on the alert.

哨兵们都警戒着。

6、Old Jolyon was on the alert at once.

老乔里恩立刻警觉起来。

7、The troops were kept constantly on the alert.

部队奉命常备不懈。

8、But we must remain on the alert.

但是我们现在仍然要保持警惕。

9、They have put the army on the alert.

他们已使军队进入戒备状态。

10、Strengthening training, always being on the alert.

加强训练，常备不懈。

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