病原体始终在进化，使免疫系统失去辨认它们的能力。

Pathogens continually evolve, confounding the ability of the immune system to recognize them.

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UVA能穿透你的皮肤，使免疫系统的功能下降，这就增加了长皱纹和老年斑的危险。

UVA rays can penetrate deeply into your skin and suppress your immune system. This increases the risk of wrinkling and age spots.

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美国的食品以及药物管理委员会在去年4月份通过了对Provenge的审核，这个癌症疫苗强化了身体免疫系统，使免疫系统会主动攻击肿瘤。

The Food and Drug Administration last April finally approved Provenge, a prostate cancer vaccine that stimulates the body's own immune system to attack tumors.

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Generally, you think about the immune system protecting against different classes of pathogens and several classes of pathogens are shown on this table.

大体上,你们会认为免疫系统使,我们免受不同种类病原体的侵害,这个表格里介绍了几类病原体

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That is, mix it with things which make it more make your immune system respond more strongly.

也就是说,增大剂量以使,你的免疫系统产生强烈的反应

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So, you couldn't introduce the live virus in because that would cause the disease not just immunity.

所以 不可以直接接种活体病毒,因为这会使人致病而不仅是引起免疫应答

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