be on duty meaning in English
当班
执勤
值班，值日，在上班时
Examples
- A policeman must not smoke while he is on duty .
警察当班值勤时不得抽烟。 - Hery is on duty eight hours a day .
享利每天工作八小时。 - Experienced banquet waiters must also be on duty .
还必须让有经验的宴会服务员当班。 - He made it a rule that either he or his wife should always be on duty in the shop during opening hours .
他规定在开店时间，妻子和他轮流站柜台。 - What are you doing ? aren ' t you supposed to be on duty
你来干嘛?你不是在职勤吗