值勤

例句：

1. 1. He has been on duty at the hospital since last night.
   他昨晚开始在医院值夜班。
2. 2. The police officers are always on duty during emergencies.
   警察总是在紧急情况下值勤。
3. 3. She is a dedicated nurse who always values her job.
   她是一名敬业的护士，总是珍视自己的工作。