按计算机病毒入侵系统的途径可将计算机病毒分为源码病毒、入侵病毒、操作系统病毒和外壳病毒。

According to a computer virus intrusion system approach can be divided into source virus, computer virus virus, operating system viruses and shell viruses.

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病毒是只有少数基因和蛋白外壳的紧凑型生物实体，对生物工程有很大作用。

Compact biological entities with little more than a handful of genes and a protein coat, viruses lend themselves to engineering.

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外壳型病毒将它们自己包裹在主程序的四周，对源程序不作修改。 外壳型病毒容易编写，这也正是约有一半病毒程序是这种类型的原因。

Shell viruses wrap themselves around a host program and don't modify the original program．Shell programs are easy to write，which is why about half of viruses are of this type．

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In that case, we took the gene for the Hepatitis B protein.

在此种情况下,我们将乙肝病毒的基因同蛋白质外壳分离

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The virus then can self-assemble, that is, you've made a lot of genetic material, you've made a lot of the structural pieces, there has to be some way that the virus can reassemble, repackage itself into active forms.

于是,病毒可以进行自组装了,也就是说,已经制造出大量的遗传物质,也制造出了大量蛋白质外壳,那么病毒就能通过某些方式,重新装配或者重新组合成活性状态

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