His experiments were the first clear demonstration of the role of a virus in one type of malignant tumor.

他的实验首次清晰地证明了病毒在一种恶性肿瘤中的作用。

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But it was not clear what test was used; only blood tests for antibodies would show whether pigs had the virus in February, when the human outbreak is thought to have begun.

但是还不太清楚的是什么检测被使用了；二月的时候，仅有关于抗体的血检验会显示猪是否携带病毒，当人类流感被认为在已经爆发时。

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It is clear that the movement and trade of poultry is making a big contribution to the spread of the virus (see article).

显而易见，家禽的流动和交易对禽流感病毒的播散起到了很大作用。

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The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14

Once that's clear, we will send it to the necessary application, be it a search engine or anti-virus software, or a stock search, or shopping, or FriendFinder - anything that can be plugged into this kind of platform.

结果一出,页面将会转到相应的应用，像，搜索引擎，或者，杀毒软件，或是，股票搜索，购物，交友网站,任何能够接入平台的东西。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

Second, the inability of existing drugs to clear the virus from the body means money needs to be spent on finding drugs that do.

ECONOMIST: The battle against AIDS

It could be that only some babies will clear the virus.

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"Prompt antiviral therapy in newborns that begins within days of exposure may help infants clear the virus and achieve long-term remission without lifelong treatment by preventing such viral hideouts from forming in the first place, " Persaud said.

CNN: Researchers: Toddler cured of HIV