来自《耶鲁大学开放课程：美国内战与重建1845-1877 第17集 第17集》

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  the single most important
  唯一重要的
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  engine of America's great industrial expansion
  使美国工业大扩张
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  or the birth of the American Industrial Revolution.
  或者说催生了美国的工业革命的引擎
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  There's plenty of scholarship now that shows us
  有很多研究表明
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  that that revolution is much older than the Civil War,
  工业革命早于内战很久之前就开始了
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  that the real launching pad of American industrialization,
  美国工业化真正的发源
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  or the launching period if you want,
  或者说开始的时期
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  to find it you got to go back
  至少得回溯到
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  at least to the 1830s and probably the 1820s.
  19世纪30年代 很可能是20年代
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  You can begin to measure this.
  可以测算一下
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  GNP in the United States -- which I guess we call GDP now,
  美国的GNP 现在我们叫GDP了
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  don't we, is that right?
  是吧