Usually it's done by taking all or part of the infectious agent, and showing them to your immune system in some way.

通常它会带着全部或部分抗原介质,并以某种方式呈递给你的免疫系统

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They're going to release a viral agent that will kill half of this country.

他们会释放出一种病毒，让这个国家一半的人丧命。

There is 实战 - SpeakingMax英语口语达人

So, it first infects you because you breathe in some of the infectious agent.

所以,只要吸入病原体,你就会被感染

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Moreover, this self is the agent responsible for the thoughts and actions of an individual to which they are ascribed.

另外，这个self还是对一个个体的,行为和思想负责的代理,这是个实物因此要经受时间。

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Usually it involves pieces of the infectious agent itself, to cause that engagement.

通常疫苗自身也包含部分传染性介质,以便达成匹配

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