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前面加介词on,例如:
1、The next crew relief comes on duty at 9 o'clock.下一批换班的员工9点钟接班。
2、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。
3、Half the garrison is/ are on duty.卫戍部队有半数在执行守备任务。
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