By arming the human body with the right kinds of antibodies researchers believe they could provide lifelong protection from most influenza strains, and perhaps even all of them.

研究人员坚信通过给人体接种正确的抗体，能够终生免受大部分甚至全部流感毒株的感染。

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Protection lasts at least 20 years and should be lifelong.

保护期至少持续20年，应为终身免疫。

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Recovery from infection by one provides lifelong immunity against that virus but confers only partial and transient protection against subsequent infection by the other three viruses.

感染一种病毒并恢复后，对该病毒具有终生免疫，但对此后感染的其他三种病毒只有部分和短暂免疫力。

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The hope is to develop a vaccine that could give lifelong protection against a majority of flu viruses, including bird flu.

VOA: special.2009.03.04