Hours ahead of Saturday's offensive, Pakistani authorities imposed a curfew and turned off mobile phone service in some areas.

VOA: standard.2009.10.17

If your cell phone goes off during an exam, I come up there. I grab your paper, I tear it in half, and I give you a zero.

如果你的手机在考试时响起的话，我会上前，将你的卷子拿过来，撕成两半，给你零分。

麻省理工公开课 - 固态化学导论课程节选

Then all of a sudden, someone's phone goes off.

突然，有人的电话响了。

I hate 课堂 - SpeakingMax英语口语达人

"This phone will work only for 11 days, when we are near the Earth, but it will be switched off later."

VOA: standard.2010.06.02

But, from this moment forth, cell phone goes off, you're out. You leave the room, OK? And, Lord help you if a cell phone goes off during an exam because those things have text messaging capabilities.

但是，从这一刻开始，手机响的话，你们就出去，你们就离开教室，好吗，上帝保佑你的手机不要在考试期间响起,因为它们有发短信的功能。

麻省理工公开课 - 固态化学导论课程节选

"Reaching for a cell phone when it's going off, you're nine times more likely to get into an accident than normally driving."

VOA: standard.2010.06.24

And Lord help you if a cell phone goes off.

如果你把手机关了的话，上帝会帮助你的。

麻省理工公开课 - 固态化学导论课程节选