As influenza viruses pass from one person, or bird, to another, they normally pick up random changes in their genes because of errors in viral replication.
当流感病毒由一个人或一只鸟传给另一个人或鸟时，由于病毒复制错误，它们通常会带上基因中的随机变化。
As influenza viruses pass from one person, or bird, to another, they normally pick up random changes in their genes because of errors in viral replication.
当流感病毒由一个人或一只鸟传给另一个人或鸟时，由于病毒复制错误，它们通常会带上基因中的随机变化。
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