她对音乐的热爱感染了孩子们。
狗咬的伤口感染了。
这种病感染了足足30%的人口。
The last reported case of smallpox in the-- naturally occurring smallpox, was in 1977, a man in Somalia was infected.
最后一例天花报告,自然产生的天花,是在一九七七年,一个索马里人感染了
Now if you smiled to-- or make three people smile, and these three people-- each one makes three other people smile.
如果你的笑-,感染了三个人,这三个人-,每个人又引起另外三人发笑。
That's important, too, because you need to be able to tell if the virus is present in the human population.
这一点也非常重要,因为你要能够分辨出,人群中是否有人感染了天花病毒
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