研究员分别这两种病毒只用了两个小时。

The researchers identified both viruses in six hours.

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当两种病毒侵入同一个细胞时，它们俩都开始复制自己。

When two viruses invade the same cell, they both begin to copy themselves.

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这个发现出人意料，因为这两种病毒的DNA序列并不高度相似。

That protection is somewhat counterintuitive: on the basis of DNA sequence alone, the two viruses are not strikingly similar.

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But because of the similarity of the viruses, the immune response that people developed would also protect them against natural infections with variola.

因为这两种病毒很相像,人体的免疫应答也能保护自己,免受天花的感染

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But variola, which causes smallpox in humans, and vaccinia, which causes a disease called cowpox in cattle, turned out to be, we now know, viruses that are molecularly very similar.

但是导致天花的人痘病毒,和导致牛痘,的牛痘病毒,后来发现其实是,我们现在知道,这两种病毒在分子水平上十分相似

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