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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两种病毒杂交成现在我们得到的这种新病毒。

The two strains mixed, and now you have a brand-new strain.

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主要有两种病毒：shell病毒和instrusive病毒。

There are two main types of viruses: shell, intrusive.

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要搞明白集约化肉用动物农场生产、传播病毒是怎么回事的，你得比较两种不同的农场。

To understand how this happens, you have to compare two farms.

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要搞明白集约化肉用动物农场生产、传播病毒是怎么回事的，你得比较两种不同的农场。

To understand how this happens, you have to compare two farms.

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