艾滋病被认为起源于非洲，那里的黑猩猩和猿携带了一种类似HIV的病毒，叫SIV(猴免疫缺陷病毒)。
AIDS is thought to have originated in Africa, where monkeys and apes harbor a virus similar to HIV called SIV (simian immunodeficiency virus).
猴免疫缺陷病毒（SIV）为猴艾滋病的病原体，在许多方面与HIV和人类艾滋病相似，是研究人类艾滋病的极好模型。
The simian immunodeficiency virus (SIV) is the pathogens of simian AIDS, similar with HIV and human AIDS, is a good model of human AIDS.
猴免疫缺陷病毒（SIV）为猴艾滋病的病原体，在许多方面与HIV和人类艾滋病相似，是研究人类艾滋病的极好模型。
The simian immunodeficiency virus (SIV) is the pathogens of simian AIDS, similar with HIV and human AIDS, is a good model of human AIDS.
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