Top government officials, led by Vice President Joe Biden, will work on policies to help the middle class.

VOA: special.2009.01.31

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

Consequently, he moved to the Middle East to work in security and management in Kuwait.

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Also, blowing a hole in the middle of your work week can leave business owners and other busy execs playing weekend catch-up rather than hitting the mall.

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If he walks on a bit farther, this time towards the middle of the work, the sense of what surrounds him changes again to give the feeling of being inside a maze.

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