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。

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If the shell mutates, the honeycomb won't lock together, and the virus would collapse.

如果病毒壳变异，蜂窝结构就会解锁，病毒随之解体。

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To expedite this search, Sankey and his student Eric Dykeman have developed a way to calculate the vibrational motion of every atom in a virus shell.

为了加快研究进度，桑基和他的学生埃里克.戴克曼(Eric Dykeman)开发了一种计算单个病毒原子震动模式的方法。

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This enables the protein shell of the virus to be analysed at the atomic level - something a billion times smaller than a pinhead.

BBC: Synchrotron yields 'safer' vaccine

In this research the scientists created a synthetic viral shell, but lacking its pathogenic RNA interior - the genetic material the virus uses to replicate itself.

BBC: Synchrotron yields 'safer' vaccine

However, dogs primarily catch the virus while in close quarters with other dogs that are coughing and sneezing, says Steven Shell, head of Merck's U.S. companion animal group.

WSJ: A New Breed of Flu Shot to Avoid Getting Sick as a Dog