"——人口数量是渐变而不是突变"? for a city, this is not necessary the case.
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送交者: steven 于 2009-08-26, 17:46:59:
回答: 这种文章为什么写得再长也是民科—— 由 Amsel 于 2009-08-26, 15:47:46:
People may move in and out of a city, and the fluctuation can be drastically comparing to natural growth.
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