It was Mrs. Dearden's day off, and Paul was on duty in her place.

那天是迪尔登夫人休息日，保尔替她上班。

《柯林斯英汉双解大词典》

It reminds me of my days on the rifle range preparing for duty in Vietnam.

这使我回想起在射击场上训练准备去越南服役的那些日子。

《柯林斯英汉双解大词典》

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

除了这些安排以外，另增救护车值班至午夜。

《牛津词典》

He was on duty when the passenger ship Titanic sank in the Atlantic Ocean in nineteen twelve.

VOA: special.2010.01.31

In another famous illustration, "The Army of the Potomac - A Sharp-Shooter on Picket Duty."

VOA: special.2010.07.25

It will house 8,000 people in tents. Fifty security guards will be on duty around the clock.

VOA: standard.2010.03.29

Hundreds of National Guard troops remained on duty in Boston on Wednesday, backing up police.

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The Commons committee also called for sharp increases in the duty on spirits - including Scotch whisky.

BBC: Commons committee backs minimum alcohol pricing

As a society lottery, the draws will be exempt from the 12p in duty paid on each pound of National Lottery sales.

BBC: Media group launches commercial lottery