When it sees a dangerous pathogen, part of the immune system is adaptive and can resist the invader even if it has never seen the agent before.
人体发现一个危险病原体时，部分免疫系统就会有所反应，并能抵抗入侵者，即使免疫系统之前从未遇到过类似的病原体。
It is clear that understanding the nature of this agent and how it causes such horrible diseases will shed new light on the interaction of a mysterious pathogen with its host.
很明确，研究这种传染源的性质和它是如何引起如此可怕的疾病的将有助于了解神秘的病原体与其宿主相互作用。
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