Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前,务必要关上电源,关好窗户。
How do you know so much about it? Have you seen the film?
你怎么知道那么多情况?你已经看过这部电影了吗?
Pierre and I borrowed the money and bought the necklace. During the next ten years we both worked day and night to pay back the money we had borrowed. That's why I now look so old. Well, after all these years we've at last paid back all the money.