1. stand sentry : 站岗；

2. come off sentry : 下岗；

3. be on sentry : 站岗；

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？

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

    Synonym: lookoutlookout mansentinelwatchspotterscoutpicket