The roads are good, a driver can see far -- and a trip hundreds of kilometers long can take just a few hours.

VOA: special.2010.04.26

How long do you have to be around a person to see him, to estimate how good a lecturer that person is?

你要看一个人多久，才能评估出他讲课有多好？

耶鲁公开课 - 心理学导论课程节选