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？