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大约12年前，这些病毒进化重组形成新的病毒，这种病毒对人的伤害更快速，使得流感病毒的检测更加重要。

And about 12 years ago, those viruses began evolving and recombining into new forms that could sicken humans much faster than before, making monitoring a bigger priority.

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研究者发现生于1918年前的人更容易产生能中和猪流感病毒的抗体。

The researchers also analyzed samples collected from humans, and found that those born before 1918 were more likely to produce antibodies capable of neutralizing the swine flu virus.

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