1·We don't do any washing on duty.
我们值班的时候不洗衣服。
2·Shouldn't you be on duty in Room Four?
你不是应该在4号房值班吗？
3·We have lifeguards on duty.
我们有救生员值班。
4·She checked Kristen's homework and attended her class open houses whenever her dad couldn't make it because he was on duty at the firehouse.
她检查克里斯蒂的作业。每当她的爸爸因为在消防站值班而不能参加学校里召开的家长会时，她便前往参加。
5·A fire fighting vehicle is always staying near the runway, it is on duty.
总有一辆消防车在跑道旁边待命。这辆消防车正在值班。
1·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》
2·Chewing gum or smoking is not allowed while on duty.
上班时间不允许咀嚼口香糖或吸烟。
3·Hello Jenny. I want to know if you are on duty tomorrow.
你好，詹妮。我想知道你明天是不是上班。
4·Chewing gum or smoking is not allowed while on duty.
上班时间，不准咀嚼口香糖，不准吸烟。
5·I'm on duty now.
我现在正在上班。
1·Then, my on duty day is over.
这样，我一天的值日就结束了。
2·Who's not on duty today?
今天谁没有值日？
3·We were on duty in the classroom when a boy rushed in.
我们正在教室里值日，就在这时一名男孩冲了进来。
4·Nobody. Maybe the student on duty forgot to turn it off.
没有人，也许是值日的同学忘记关了。
5·Today is my on duty.
今天是我值日。
1·The winter of Heilongjiang Province of very cold and very long, the machine lab of nobody on duty will consume a large amount of electric energy to get warm in winter.
黑龙江冬季寒冷且时间长，各无人值守机房在冬季将消耗大量电能来取暖。
2·Flexible and portable operation, low labor intensity, one person can be on duty more than one equipment, production efficiency is high.
操作灵活轻便，劳动强度低，一人可值守多台设备，生产效率高。