on duty

The man on duty rang an alarm.

值班员发出报。

The nurses' schedules dovetailed, so that one was always on duty.

护士的时间表很吻合，所以总有人值班

Half the garrison are on duty.

有半数卫在执勤。

The officers on duty were visibly overcome, many of them in tears.

那些值班的官员明显不能自持，许多人都流出了眼泪。

In addition to these arrangements, extra ambulances will be on duty until midnight.

除了这些安排以外，还增派救护车值班午夜。

The patrol police on duty are on the alert against any possible disturbances.

"值班巡处于戒备状态,随时准备应付任何可能发生的骚乱。"

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

在执勤时必须时刻保持覺。

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

子上的标标明他正在执勤。

Eight are on duty.

八个人在值班。

Six are on duty.

六个人在值班。

They enjoyed exemption from customs duties on goods to be used by themselves.

他们的自用物品获得免除关税。

For the tort based on omission, Legalasks for injurer assuming corresponding liability, it is based on action duty of injurer.

对于基于不作为的侵权行为，法律要苛以加害人承担相应的责任，必须以加害人负有作为义务为前提。