H.I.V. evolved about a century ago from a chimpanzee virus known as simian immunodeficiency virus, or S.I.V..
例如，HIV是在100年前从猴免疫缺陷病毒，或叫SIV的黑猩猩病毒演化而来。
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。
AIDS is thought to have originated in Africa, where monkeys and apes harbor a virus similar to HIV called SIV (simian immunodeficiency virus).
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)。
The primate version of the virus that causes AIDS is called simian immunodeficiency virus (SIV), but most apes and monkeys that are infected with it show no symptoms of illness.
艾滋病病毒的灵长类动物版本被称为猴免疫缺陷病毒（SIV），但大多数感染此病毒的猿猴并没有显示任何疾病症状。
There are some other types of immunodeficiency viruses that specifically affect cats and other primates, namely the Feline immunodeficiency virus (FIV) and Simian immunodeficiency virus (SIV).
一些其他类型的免疫缺陷病毒可以影响猫和其他灵长类动物，即猫科类免疫缺陷病毒(fip)和猿猴免疫缺损病毒(SIV)。
Routine genetic sequencing of the virus showed it looked like no other sample of AIDS virus and it was eventually compared to a gorilla simian immunodeficiency virus, itself only discovered in 2006.
病毒常规基因序列表明与其它艾滋病病毒样本看上去不一样并且它最终与仅在2006年发现的一大猩猩猿免疫缺陷病毒比对。
Routine genetic sequencing of the virus showed it looked like no other sample of AIDS virus and it was eventually compared to a gorilla simian immunodeficiency virus, itself only discovered in 2006.
病毒常规基因序列表明与其它艾滋病病毒样本看上去不一样并且它最终与仅在2006年发现的一大猩猩猿免疫缺陷病毒比对。
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