来自《耶鲁大学开放课程：欧洲文明 第12集 第12集》

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  That's all perfectly obvious.
  这些都很显然
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  The next step is to say, "Where does the population of cities come from,
  下一步要问 "这些城市的人从哪里来
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  and who are all these people that are increasing the population of cities
  谁又造成了那些城市的人口增长
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  and are part of this process, in a statistical sense, of urban growth?"
  从统计学角度讲 推动城市发展的又是何人"
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  The second point that I'll make is what people thought about this.
  我想说的第二点是 人们对此有何看法
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  What did they think about these teeming cities?
  他们是怎样看待这些熙熙攘攘的城市的
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  "Teeming" Was a word that they started to use to describe
  "熙熙攘攘"一词是用来形容
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  these cities that seemed to be kind of runaway cities.
  那些发展迅猛到有点失控的城市
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  First of all, I'm not going to write this on the board,
  首先 我不打算把它写在白板上
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  despite the fact it's the only mathematical formula that I even know.
  尽管那是我唯一知道的一个数学公式
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  If you were trying to explain the growth of any city
  如果你想解释任何一个城市
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  from Point 1 in time to Point 2 in time,
  从时间点1到时间点2 所产生的增长