Last year's top words were Twitter, Obama and the flu virus H1N1.

去年居于榜首的热词为Twitter、奥巴马和猪流感病毒H1N1。

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Hemagglutinin is a viral protein that enables the flu virus to enter host cells.

血凝素是一种病毒蛋白，能帮助流感病毒侵入宿主细胞。

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The researchers do not know exactly what it is about low absolute humidity that the flu virus likes.

研究者们并不完全清楚为什么流感病毒喜欢低的绝对湿度。

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The scientists identified a protein that inactivates the flu virus before it can mutate.

VOA: special.2009.03.04

"There are parts of the flu virus that could be the target of what we would hope eventually could be a universal influenza vaccine."

VOA: standard.2010.07.21

Right now,as schools prepare to begin a new year, one concern is the H1N1 virus, often called swine flu.

VOA: special.2009.08.13

The organism Ignacio Cirac and Oriol Romero-Isart have in mind is the flu virus.

ECONOMIST: An old thought experiment may soon be realised

The GlaxoSmithKline drug has been available since 1999 and stops the flu virus from spreading.

BBC: NEWS | Health | Killer flu: Could the world cope?

Avoid touching your eyes, nose and mouth as this can spread the flu virus to others.

FORBES: 2013 Flu Season: How to Protect Yourself