Common viruses or bacteria may also increase the chances that some people will develop the disease.

VOA: special.2009.01.06

You know that some viruses use RNA as their genetic material and so their lifecycle is going to be slightly different than this.

有些病毒利用RNA作为遗传物质,而且正因如此,它们的生命周期,会与前者有所不同

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These are some problems with retro viruses.

这就是症结所在了

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Or you get a cold, the cold virus takes hold, the viruses start replicating inside of you and it takes some time for immune system to gear up to eliminate it, so we're used to thinking about responses that take some time.

或者你得了感冒,感冒病毒扎根在你的身体中,病毒开始在你体内复制,免疫系统需要一定时间做好准备去消灭它,所以我们曾认为免疫反应需要一定时间

耶鲁公开课 - 生物医学工程探索课程节选