The rule is that someone must be on duty at all times.

按照规定,任何时候均需有人值班.

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Experienced banquet waiters must also be on duty.

还必须让有经验的宴会服务员当班.

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I'd love to come. But I have to be on duty this weekend night.

我是想过来, 但我周末晚上得值班.

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I can't be on duty tonight, would you please take my place?

今晚我不能出乘了, 麻烦你替我一次好 吗 ?

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Who will be on duty at six o'clock? --- I will.

6点钟谁值班? - 我值班.

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Who will be on duty tonight?

今晚的夜班谁当值?

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Who will be on duty tomorrow?

明天谁值班?

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Today it's my turn to be on duty.

今天该我值日.

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Sometimes he has be on duty at night.

有时他会在夜间值班.

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Under special conditions, the company will require staffs be on duty during holidays.

于特别情况下, 员工必需应公司之要求在假日出勤.

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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.

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Jack was on duty yesterday. He will be on duty again next month.

杰克昨天值过日. 他下个月在值日.

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Tokyo's trains and metros meet thousands upon thousands people to be on duty and off duty.

东京的火车和地铁每天接送成千上万的上下班.

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