Given all the disadvantages of living in aggregated towns, why did people in the thirteenth century move into these closely packed quarters?

考虑到住在集群式城镇的种种弊端，为什么13世纪的人们会搬到这些拥挤的地方呢？

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“There were many species in cages closely packed together,” says Yi.

“许多物种在笼子里紧紧挤在一起”，他说。

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The molecules in such liquids are closely packed but loosely arranged.

这种液体中的分子可以形成紧密的排列，但平时处于松散状态。

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The wreck occurred when several closely packed cars were jostling for position at top speeds of about 175 mph.

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Saturday's wreck occurred when several closely packed cars were jostling for position at top speeds of about 175 mph.

CNN: February 24, 2013 -- Updated 2355 GMT (0755 HKT)

The track itself is a sequence of closely packed rectangular metal frames, each of which can act as an independent electrical circuit.

ECONOMIST: Maglev trains