China has acknowledged the need to limit its carbon emissions, but argued that greater responsibility falls on advanced industrialized nations like the United States, which produced large quantities of greenhouse gases for decades before China's rise as a global economic power.

VOA: standard.2009.11.26

There's a kind of puzzle there as to-- even if, before we move to the question, how widespread are cases like this?

这里又产生了一种疑团-,甚至在我们探讨，这种案例有多普遍之前？

耶鲁公开课 - 死亡课程节选

So the result is we can combine all of these as a single differential, and just like we've seen before, what that suggests is that we define another new quantity given by this expression.

结果就是我们能把所有的结果,整理成一个单一的微分，就像我们前面看到的一样，这说明我们可以利用这个式子,定义一个新的物理量。

麻省理工公开课 - 热力学与动力学课程节选

Typically, these are recent imaging methods like CAT scan and PET scan and fMRI which, as I said before, show parts of your brain at work.

通常是应用现代的成像技术来进行研究,比如电脑断层扫描,正电子发射断层扫描技术,以及功能性核磁共振成像,正如我之前所说,这些技术可以让你看到大脑的活动区域

耶鲁公开课 - 心理学导论课程节选