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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began to plummet, despite the fact that the开始直线下降 即便在十九世纪 -
nineteenth century provided conditions that would have been各种环境都适宜天花病的传播泛滥 -
favorable to promoting the disease: improved and speedy改善的快速交通 -
transport, with steamships,比如蒸汽船 -
canals and the railroads; crowding with a population that加上运河和铁路 大量流动性强 -
was ever more mobile, massive growth and urbanization增长快速的人口 城市化 -
and large cities.还有许多大城市 -
And those changes and这些变化 -
advances were reproduced across Europe和进步在欧洲和北美 -
and North America.反复上演着 -
And there were technological improvements as well--那时还有许多技术改善 -
all of which leads me to the end of this morning--这些都导致了我要讲的最后一点