Anyone? How many times can you tear a 4 billion page phone book in half?

谁知道？,40亿页纸每次对半撕，你能撕多少次？

哈佛公开课 - 计算机科学课程节选

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

I need you tear not the page out; I need you to tear this phone book in half in front of 500 of your peers.

我不是要你仅仅撕下来那一页;,我要你当着500位同学的面,把整个电话薄撕成两半。

哈佛公开课 - 计算机科学课程节选