克莱恩认为，HIV病毒可能通过进化，逃脱了人体免疫系统用于抵御病毒感染的重要手段。
Klein believes that, HIV virus may evolve to escape the body's immune system to ward off an important means of infection.
通常当病毒感染细胞的时候，宿主的免疫系统能够抵御并最终消灭病毒。
Usually when viruses infect cells, the host immune system can fight to eventually clear the virus.
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