来自《耶鲁大学开放课程：1600年后西方社会的流行病 第11集 第11集》
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what he called a mortality revolution;他所谓的死亡率革命时 -
a demographic transition in which cities,这是指一个城市在初期 -
for the first time, become places that are成为一个膨胀的区域 -
dependent for their expansion not only on inward migration而其膨胀不仅仅依赖于人口的内迁 -
to the towns, but on the fact that the longevity而且也依赖于其人口出生率超过死亡率 -
and the birthrate come to exceed the death rate;这一现象的持久性 -
which was something new, a real demographic revolution.这是一种新的现象 即所谓的人口革命 -
And why was this achieved?那么 这是怎么形成的呢 -
Many people have thought and postulated that it was due许多人都考虑过并假定为 -
to medical science, to conscious policy这现象应归功于医学科学 慎重的政策 -
and those sorts of explanations.等等其他各种解释 -
McKeown instead stresses two factors.反之 麦基翁着重强调两种因素