off duty的用法和樣例：
例句
- A herd of commuters got off the train.
一群乘火車上下班的人走下火車。 - I'll stop by when I get off work.
我下班的時候會順便來看看的。 - Policemen wear their uniforms when they are on duty.
警察在值班的時候都穿著制服。 - You are very lucky I am on duty, and can't be bothered with a troublemaker like you.
你很幸運，我正在值班，所以不會在你這樣愛惹事的傢伙身上操多少心。
