艾滋病病毒侵入人体后通过什么途径摧毁免疫系统？ 当艾滋病病毒通过性接触传播时, 病毒必须穿过组织屏障进入人体。
What route does HIV take after it enters the body to destroy the immune system？
异性间的性接触是造成大多数艾滋病病毒传播的原因。
Heterosexual contact is responsible for the bulk of HIV transmission.
在任何接触性传染病的传播中，每一次传染都涉及两类人，一类是已患病者，一类是未患病者。
In the spread of any contagious disease, each act of infection has two parties, one who already has the disease and one who does not.
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