So the problem here, roughly, is given, a number of cities, and say the cost of traveling from city to city by airplane, what's the least cost round trip that you can find?

基本上就是一个这样的问题,你被告知了一些城市,以及在城市之间坐飞机旅行的花费,那一条是你们能找到最短往返路径？

麻省理工公开课 - 计算机科学及编程导论课程节选

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