This is a sign of my economic status: I don't have to work. It is middle and lower-class women who do not get to observe purdah in this way.

但这恰好是我经济地位的标志：,我不需要工作，只有中下阶层的女人,才像这样不遵守深闺的习俗。

普林斯顿公开课 - 人性课程节选

So, either of those ways of figuring this out is the first guess of what goes in the middle will work pretty well.

因此，用上述任何一种方法来初步,估计哪个原子应该在中间都是相当好的。

麻省理工公开课 - 化学原理课程节选

Work the big middle.

先解决这大量的中间部分。

麻省理工公开课 - 固态化学导论课程节选

When you get to say the middle of the nineteenth century and the work of the great English historian of Ancient Greece, George Grote, he begins his story in 776 with the Olympic Games.

十九世纪中叶,有一位研究古希腊的,伟大英国历史学家乔治·格罗特,他从公元776年的奥运会开始执笔

耶鲁公开课 - 古希腊历史简介课程节选