He's on duty twenty-four seven.

他不分昼夜地天天上班。

Who's on duty today?

今天谁值班？

There will only be a skeleton staff on duty over the holiday.

假期将只留必需的少数职员值班。

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。

Robyn asked the deputy on duty if she could speak with Sheriff Adkins.

萝宾问值班警官她能否跟县治安官阿德金斯谈话。