来自《耶鲁大学开放课程：1600年后西方社会的流行病 第7集 第7集》

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  It therefore led the Spaniards, out of necessity,
  于是 西班牙人只好为了矿井
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  to turn to a different source of labor for mines and
  和种植园重新再寻找
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  plantations.
  劳动力来源
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  And since Africans and Europeans shared disease
  由于非洲人与欧洲人
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  reservoirs that were partially overlapping,
  有一部分相似的病史
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  their people were resistant to many of the same epidemic
  非洲人对于许多几乎摧毁了美洲印第安人的
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  diseases that had destroyed the Native Americans.
  疾病都具有抵抗力
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  So, disease was a major factor in the establishment of the
  所以 其实疾病是导致非洲黑奴贸易
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  African slave trade and the development of New World
  以及新大陆奴隶制度的
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  slavery.
  主要因素之一
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  The Spaniards hardly delayed.
  西班牙人几乎没有浪费任何时间
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  1517 marked the beginning of
  从1517年起