另一方面，一旦感染了艾滋病病毒，人的免疫细胞就会攻击与人组织相容性抗原结合的艾滋病病毒。

On the other hand, once infected with HIV, the human immune cells will attack and human histocompatibility antigen-binding HIV.

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抗体通过与刺激其产生的特定抗原结合来执行其功能。

Antibodies perform their function by combining with the specific antigens that stimulated their production.

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然后是与载体结合的靶物质本身，他们是一组叫做半抗原的较小的分子。

Then there is the target itself, a set of smaller molecules called haptens that are attached to the carrier.

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So, now you have a single molecule, very large molecule, with not just two binding sites but with ten binding sites.

所以如果你体内有一个细胞,一个体积很大的细胞,细胞表面不只有两个抗原结合位点,而有十个抗原结合位点

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The advantage of this is that now you have four binding sites for antigen instead of just two.

这样的好处是一个抗体上,有四个抗原结合位点而不仅仅是两个

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So, I have a bacteria infection, stimulates my immune system, I start making antibodies that bind to an antigen specific to that bacteria.

所以 如果我被细菌感染了,我的免疫系统被激活,开始制造抗体,这些抗体结合到细菌特异性的抗原上

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