According to a computer virus intrusion system approach can be divided into source virus, computer virus virus, operating system viruses and shell viruses.
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。
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．
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。
There are four main types of viruses: shell, intrusive, operating system and source ode．
有四种类型的病毒程序：外壳型、入侵型、操作系统型和源码型。
There are two main types of viruses: shell, intrusive.
主要有两种病毒：shell病毒和instrusive病毒。
Viruses only contain a shell of protein and some DNA and RNA genetic makeup materials.
病毒只有一个蛋白质外壳和一些DNA和RNA这样的遗传物质。
practices to control viruses in food, especially noroviruses (NoV) and hepatitis A (HAV) in fresh produce, mulluscan shell fish and ready-to-eat food;
采取措施控制食品中的病毒，特别是新鲜产品、软体贝类和即食食品中的诺如病毒和甲型肝炎病毒；
There are four main types of viruses: shell, intrusive, operating system and source code.
有四种类型的病毒程序：外壳型、入侵型、搡作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system, and source code.
有四种类型的病毒：外壳、入侵、操作系统和源码。
Shell and intrusive viruses most commonly attack executable program flies-those with a. com or. exe extension, although data flies are also at some risk.
外壳型和入侵型病毒通常攻击可执行文件，即带有或扩展名的文件。当然数据文件也有受攻击的危险。
Viruses only contain a shell of protein and some DNA and RNA genetic makeup materials. To reproduce, the virus invades a cell in a host and USES the cell to produce more of itself.
病毒只有一个蛋白质外壳和一些DNA和RNA这样的遗传物质，通过侵入宿主细胞并利用宿主细胞来进行复制。
Viruses only contain a shell of protein and some DNA and RNA genetic makeup materials. To reproduce, the virus invades a cell in a host and USES the cell to produce more of itself.
病毒只有一个蛋白质外壳和一些DNA和RNA这样的遗传物质，通过侵入宿主细胞并利用宿主细胞来进行复制。
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