Earlier this summer I was at a smelter in Japan, the largest titanium smelter on the planet.

早在这个夏天我去了日本一家熔炼厂，那是全世界最大的熔炼厂。

麻省理工公开课 - 固态化学导论课程节选

But then also a little bit about your history, where you come from, some of your experiences which have helped you or informed your opinions on this very difficult issue that the entire world really is spending a lot of time trying to work on.

然后再谈谈你们各自的经历，你们从何而来，谈一些你们自己的经历,一些帮助过你们，或形成了你们,就这个复杂问题的观点,这个全世界都在投入大量时间试图解决的问题。

普林斯顿公开课 - 人性课程节选