来自《耶鲁大学开放课程：1600年后西方社会的流行病 第15集 第15集》

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  in its history.
  三个时期
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  The first is the one
  首先是
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  that we're going to be concentrating on this morning,
  我们今天上午的焦点话题
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  and that's the period from roughly the 1890s
  这是从大约十九世纪的九十年代
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  until more or less the First World War.
  直到第一次世界大战前后
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  That marks the real heyday of tropical medicine,
  它标志着热带医学真正的鼎盛时期
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  the time when it was the cutting edge of medical science,
  热带医学的顶峰时期
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  when it made a series of major discoveries,
  在当时 热带医学作出了一些列重大的发现
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  and served the most obvious political purposes.
  而最明显的是 其强烈的政治目的
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  It was followed in its history by a second period,
  随后在历史上第二个时期
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  that lasts more or less from World War I until the 1970s,
  从一战持续到了二十世纪七十年代
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  the next half-century of tropical medicine.
  热带医学的下半个世纪