A policeman has to keep on his toes all the time he's on duty.

警察在执勤时必须时刻保持警覺.

《简明英汉词典》

The striped band round a policeman's sleeve is to signify that he is on duty.

警察袖子上的袖标标明他正在执勤.

《简明英汉词典》

Half the garrison are on duty.

有半数卫戍部队在执勤。

辞典例句

Half the garrison is / are on duty.

有半数卫戍部队在执勤.

辞典例句

US Soldiers secure an area after dark in Baghdad.

入夜后的巴格达,一名美军士兵在执勤.

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A police officer was gunned down in the line of duty.

一名警官在执勤过程中被枪杀.

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The police officer was back on duty after having cut his hair short, a spokeswoman said.

一位女性发言人表示,这位警官在剪短头发之后,已经回来执勤.

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

在一所大学门口,一名保安正在执勤.

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Up to 12 officers can operate out of the bus, which will be sent into crime - ridden areas.

这部车将被送往犯罪频繁的地区,有多达十二名警官可以在车里执勤.

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We will make the People's Armed Police more proficient and more capable of responding to emergencies.

进一步增强人民武装警察部队执勤和处置突发事件的能力.

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The guard is sweating so much that the shirt is almost wet on this back.

保安执勤很卖力,衬衫湿透,地下是补充水分的饮料.武警是自备水杯,保安是统一绿茶饮料.

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Any railway worker when carrying out transport safety inspection shall bear an on - duty identification sign.

实施运输安全检查的铁路职工应当佩戴执勤标志.

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Perhaps it is because too many people, booking hall entrance, two more police on duty.

也许是人太多的缘故, 售票大厅大门口多了两名执勤的民警.

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