来自《耶鲁大学开放课程：1600年后西方社会的流行病第4集第4集》

great chain of infection had been broken,

感染链最关键的
in the chain of transmission;

一个环节断裂了
perhaps that the infected population

或许所有黑死病的宿主
of black rats had been destroyed;

都已经死掉了
that all of the susceptible members of the human population

所有容易被感染的人员
had already perished; that the onset of winter

都已经离去了严冬的到来
and cold weather had reduced the activity of fleas.

寒冷的天气降低了鼠蚤的活动率
In any case, the point I want to make

无论如何我想说得是
was that eventually

最终人们所采取的
the plague measures and regulations were,

疾控的措施与政策
or at least seemed to be, effective,

被事实证明是可行的
especially after the seventeenth century

尤其自十七世纪后