富有的家庭会为执勤的人送去食物和饮用水。

Rich families bring food and water to those on duty.

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我们又许多执勤警力，但显然不够。

We had a lot of police on duty, but clearly not enough.

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今天他们仍在执勤但是明天呢？

They 're still on duty. But what about tomorrow?

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在变电站旁边执勤的保安上前询问。

The security on duty at the substation next to the question came up.

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在一所大学门口，一名保安正在执勤。

At the gate of a university a security guard is standing on duty.

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欢迎家长志愿要求执勤的任务和时间。

We are encouraging all parents to volunteer their time to help with the patrol tasks.

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第十项：执勤队员宣誓。

Team member take a pledge.

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警察不执勤时不穿制服。

The policeman donot wear uniform when they are off duty.

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几百个警察在执勤。

Several hundred police were on duty.

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几百个警察在执勤。

Several hundred police were on duty.

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