名词哨兵; 警卫

1. stand sentry : 站岗；

2. come off sentry : 下岗；

3. be on sentry : 站岗；

2. sentry的解释

名词

1. A sentry stood on guard at the corner.
一个哨兵在角落里站岗。

2. Paul has just come off sentry duty.
保罗刚退哨。

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1. 哨兵;警卫
A sentry is a soldier who guards a camp or a building.

e.g. The sentry would not let her enter...
警卫不让她进去。
e.g. Aren't you supposed to be on sentry duty?
你不是应该在站岗吗？

noun

1. a person employed to keep watch for some anticipated event

Synonym: lookoutlookout mansentinelwatchspotterscoutpicket