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.
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.
Half the garrison are on duty.
有半数卫戍部队在执勤。
Half the garrison is / are on duty.
有半数卫戍部队在执勤.
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.
A police officer was gunned down in the line of duty.
一名警官在执勤过程中被枪杀.
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.
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.
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.
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.
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.
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.
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.