In fact, you'll find the probability of this happening 3% is only about 3 percent, of it happening just by accident.

实际上你会发现,出现这种情况的概率是，所以说他们的实验结果完全是偶然的。

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And so, if this was a disease that entered your community, you could have expected several centuries ago.

所以,假如这病出现在你周围,可以料到在几个世纪前,情况会怎样

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