But then I ask them to think, and in the book I ask the readers to think: Well, have you given a cost of an expensive pair of shoes to save the life of one of the around 9 million children who are dying from poverty related causes each year around the world?

但是，接着我让他们思考，在书中，我让读者思考这样一个问题：,你有没有捐出过买一双鞋的钱,来拯救900万儿童中的一个生命？,他可能正因为贫困导致的种种问题,而生命垂危，每年世界上都会有这样的儿童？

普林斯顿公开课 - 人性课程节选

And this is a very fast speed, of course, it's about 700 million miles per hour. So, one way to put that in perspective is to think about how long it takes for a light beam to get from earth to the moon. Does anyone have any guesses? Eight seconds, that sounds good.

当然这是一个非常快的速度，它大约是每小时7亿英里,为了更形象化，我们,看看光从地球到月球,需要多少时间，你们猜猜是多少？,8秒，猜的不错。

麻省理工公开课 - 化学原理课程节选