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The city is an extraordinary processor of mass and energy and has its own metabolism.

城市是质量和能量的特殊处理器，有着自己的新陈代谢。

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During this period,many experts warned of mass starvation in the developing world where populations were expanding faster than crop production.

VOA: special.2009.11.10

That is why we don't worry about the motion of the nucleus 1 because the ratio of mass is about 2,000 to one.

这就解释了为什么我们不担心,原子核运动起来,因为原子核和电子的质量比约为2000：

麻省理工公开课 - 固态化学导论课程节选

So, what's the conservation of mass if we divide by the atomic masses here?

那么质量守恒是什么呢？,如果我们在这儿按原子质量划分？

麻省理工公开课 - 固态化学导论课程节选

But this was a sign of mass voting from Turkey, not of a freethinking boom.

ECONOMIST: And what it says about the role of public intellectuals

In an age of mass production, it is a delight to visit these family-owned wineries.

BBC: Uruguay��s boutique wineries

As long as the threat of water charges looms, so will the threat of mass non-payment.

BBC: NEWS | UK | Northern Ireland | Water bills 'on hold' after deal