SIV and human are so far known to the nearest HIV virus.

SIV是迄今已知与人类艾滋病病毒最接近的病毒。

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SIV can mutate into a form that allows it to pass from human to human.

因为SIV能变异成能在人类中传播的病毒。

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SIV can mutate into a form that allows it to pass from human to human.

因为SIV能变异成能在人类中传播的病毒。

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