来自《耶鲁大学开放课程：1600年后西方社会的流行病 第3集 第3集》
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in a frenzied bid to survive,在求生的疯狂本能之下 -
the flea feeds repeatedly,跳蚤会不停的进食 -
and in each bite inoculates perhaps a hundred thousand bacteria每一口都会给温血动物的血液中 -
into the bloodstream of its warm-blooded victim.输入大约十万个细菌 -
So, when a rodent host of fleas sickens and dies,当跳蚤的啮齿类宿主被感染死亡后 -
the fleas leap to the warm body of another mammal跳蚤会离开这个尸体去另一个动物身上 -
that passes within leaping radius.这个距离在跳蚤的跳跃半径以内 -
And the flea also is capable of hibernating跳蚤还可以冬眠 -
for as much as a couple of months,这可以持续几个月 -
lying in wait.等待着新的受害者 -
Now, how did human beings come to be involved那么 人类是如何被卷入 -
in this catastrophe?这场浩劫的呢