By analogy, memes also get replicated and in the process pass on cultural information from person to person, generation to generation.

以此类推，模因也被复制，并且在这个过程中，文化信息在人与人之间、代际之间进行传递。

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If the H5N1 virus changes to allow it to pass easily from person to person, and it goes unchecked, this could trigger an influenza pandemic.

如果H5N1型病毒发生变异，使其容易地在人间传播并得不到遏制，这就可能引发一场流感大流行。

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One way for an animal virus to become able to pass easily from person to person is to combine with a human virus.

对一种动物病毒而言，能够使其更容易地在人与人之间传播的一种方式是与人类病毒结合。

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Now we don't need the cow anymore because you could pass it from one person to another, and pass the immunity from one person to another.

由于它可以在人与人之间传播,就不再需要奶牛了,就可以把免疫力在人与人之间传播

耶鲁公开课 - 生物医学工程探索课程节选

Such cases are monitored very closely because of fears that a new strain of swine flu with the ability to pass from person to person could spark a pandemic.

BBC: Experts probe deadly Mexico flu

The H5N1 bird flu can be deadly to people, but as far as scientists know, it does not easily pass from person to person by way of respiratory droplets -- yet.

CNN: Bird flu research resumes -- but not in U.S.

Unlike at the end of the first world war, there is now a global disease-surveillance system which would sound the alarm if H5N1 showed signs of being able to pass from person to person.

ECONOMIST: Averting a global plague | The