M: Good afternoon, everyone. The experiment is to start at 3:00. Have you gone through the instructions?
同学们下午好。实验3点钟开始。你们阅读操作指南了吗？
W: Yes, sir.
是的，老师。
M: Ok, now some points for attention. First of all, pay attention to safety... Now, sign your names on the lab record, and after that you can start. If there is any question, just let me know.
好的，现在，请注意几点内容。首先，注意安全。现在，在实验记录表上签上你们的名字。签好之后你们就可以开始了。有什么问题就问我。
W: Excuse me, sir. This air compressor doesn't work.
老师，打扰了。这个空气压缩机不能工作。
M: Have you turned it on?
你开开关了吗？
W: Yes, I have.
是的，我已经开了。
M: Ok, I will get you another one.
好的，我拿另一个给你。
W: Thank you.
谢谢你。
