现在，所有的河流和湖泊不是干涸就是被污染了。

Now, all the rivers and lakes are either dry or polluted.

youdao

你知道，我仍然不是很清楚水文循环，也就是水在地球和大气之间的来回转移。

You know, I am still not too clear about the hydrologic cycle, the transfer of water back and forth between the earth and the atmosphere.

youdao

她的工作就是控制，就是法律和命令——而不是彬彬有礼。

Her job is about control, about law and order - not about being polite and gentle.

youdao

Spectroscopy is how you go and look at patterns, not just individual lines.

光谱学就是你怎样运行和看待一个图案的，而不是单独的线条。

麻省理工公开课 - 固态化学导论课程节选