And many have. Yet now comes a study showing an increase in the number of injuries in "phys ed" class.

VOA: special.2009.08.06

I'm guessing the average number in the class now is probably about 3 or 4, maybe even lower.

我猜这次的平均数字大约在3或者4,甚至可能更低

耶鲁公开课 - 博弈论课程节选

These guys are just counting the number of people in the class for the registrar, so they're not doing anything more nefarious then that.

这些人只负责统计,班级人数然后交给注册处,所以他们不会做什么过分的事情

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Now, so there's probably a number of people in this room, so when I first started teaching this class 20 years ago, everybody in the room had had chickenpox.

现在,这间教室中的很多人也许,在二十年前,我第一次教这门课的时候,当时教室里的每个人都得过水痘

耶鲁公开课 - 生物医学工程探索课程节选

He does go around and around the same idea a number of times, which does cut down on the notes for the class, " but it can get a little boring."

他的确一遍遍重复同样的观点很多次，从而减少了课程的笔记内容，但是会让人感到有点无聊“

耶鲁公开课 - 死亡课程节选

and I asked you to give yourself a percentage rating relative to the rest of the class, then if everybody was accurate, or at least not systematically biased, the number should add up to 50%.

我要你相比于其他同学的表现，给自己一个百分数，如果大家都准确地评价自己，或者说大家都不偏心于自己，那么平均百分数应该是50%的。

耶鲁公开课 - 心理学导论课程节选

Every game we've seen in the class so far has had a discrete number of strategies.

目前为止我们遇到的博弈,每个策略都是不连续的

耶鲁公开课 - 博弈论课程节选

Without showing your neighbor what you're doing, put in the box below a whole number between 1 and a 100 We will calculate the average number chosen in the class.

从1到100之间选择一个号码填到,下面的方框内,不要让你同桌看到,我们会计算全班的平均数

耶鲁公开课 - 博弈论课程节选

All of you, at the end last time, wrote down this number and handed them in so we had one number, one strategy choice for each person in the class.

上节课大家都交上来了一个数字,所以每个人都有对应的数字,这就是每个人都有一个策略

耶鲁公开课 - 博弈论课程节选