Influenza develops after the virus enters a person's nose or mouth.

在病毒进入一个人的鼻或口之后流感发作。

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The virus enters liver cells before unloading genetic material and proteins.

病毒在进入肝细胞前先要卸下遗传物质和蛋白。

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When the AIDS virus enters the human body does not soon make the body an unusual feeling.

当艾滋病病毒进入人体后并不会很快使人体有异常的感觉。

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Chan notes no one can predict what will happen later in the year when the southern hemisphere enters its influenza season and the virus spreads more rapidly throughout the population.

VOA: standard.2010.01.18

The virus enters the cell and it breaks down.

病毒进入细胞后分解

耶鲁公开课 - 生物医学工程探索课程节选

Because HIV is an RNA virus and if it enters your cell the only way it can replicate, it can put its DNA into your cells, is by first making DNA out of its RNA genome.

因为HIV是RNA病毒,如果它进入你的细胞,它复制自己的唯一方式,它能把自己的DNA转入你的细胞,方法是先用自己的,RNA基因组制造出DNA

耶鲁公开课 - 生物医学工程探索课程节选

And, as a bonus, it is the protein that locks on to the surface of a host cell before the virus enters it.

ECONOMIST: Recipes for an AIDS vaccine

Scientists say it isn't clear whether the drug will work for all groups at high risk of infection because the virus enters the body in different ways in each case.

WSJ: Daily Pill Slashes Risk of HIV Infection in Study