来自《耶鲁大学开放课程：美国内战与重建1845-1877 第11集 第11集》

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  first, secession, because I left you hanging in the air
  首先 我们要讨论下脱离联邦这个词
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  about the various explanations of secession,
  之前我让你们查这个词
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  interpretations over time;
  在不同时期的解释
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  and I want to re-visit that at least briefly.
  我会简单的重新梳理一遍那些解释
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  And then I want to take you through a little quick survey
  然后我要给你们做个小调查
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  of the interpretations of Civil War causation over time.
  调查你们所认为的内战肇因
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  It's fascinating to understand how in the past,
  理解过去很有意思
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  now nearly a century and a half,
  过去快一个半世纪了
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  Americans have gone through this topsy-turvy,
  美国人对引发内战的肇因的认识
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  twisting inside out, changing view of what caused that war.
  经历了怎样翻天覆地的变化
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  But back to secession.
  回到脱离联邦这个词
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  I left off with saying I was going to
  我说过要给大家