on guard

on guard 基本解释

在岗, 警惕

词组短语

1、go on guard 上岗

2、feel on guard 保持警惕

3、be on guard against 提防警惕

4、on guard against 提防

5、on guard position 处于警戒位置

6、be on guard 防范；惕励；惕历

on guard 用法和例句

1、You should be on guard against pickpockets.

你要谨防扒手。

2、They startle easily and are often on guard.

处于防御状态。

3、He told us again and again to be on guard.

他一再要我们提防。

4、On guard of the West Nile Fever invading China

严防西尼罗热传入

5、A sentry stood on guard at the corner.

一个哨兵在角落里站岗。

6、Put none but Americans on guard tonight.

今夜只让美国人担任警戒。

7、Be on guard when somebody flatters you.

有人奉承你时，一定要当心。

8、A sentry was on guard at each of the gates.

每个大门有一名哨兵站岗。

9、On guard, being awake while others sleep.

警戒的，他人尚在沉眠时就已经苏醒。

10、Governments should always be on guard against danger.

政府应当总是对危险有所预防。

重点词汇

guard n. 守卫者, 警戒, 护卫队, 防护装置 vt. 保卫, 看守, 当心 vi. 防止, 警惕, 警卫, 看守