Like influenza, hepatitis a virus infection zone, not all people infected with the virus, which is among the body there is a strong reason for the weak.

就像流感、甲肝病毒传染区，不会所有的人都会感染病毒一样，这就是人群中身体有强有弱的缘故。

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To protect themselves from viruses, plants create a zone of dead cells around an infection site that prevents the infection from spreading.

为了避免病毒的感染，植物会在感染位点形成一个死细胞区域，这种地带能够阻止感染的扩散。

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