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。

Thanks.The same to you. Bye.

谢谢。也祝你旅途愉快！

The earth shook for quite a while.

地面震动了好一阵子。

Ask Mr. Wu if you can have some old boxes.

问问吴先生，你能否搞到一些旧箱子。

Ouch!

哎哟！

The characters on the paper were white, and the rest of the paper was black.

纸上的汉字呈白色，其余部分成黑色。