从而我们可以简单地认为H5N1病毒缺乏成为大流行流感的能力，而H5N1要具有更强的传染性，它的致病性就不得不减弱。
That led to hopes that the H5N1 virus simply lacked the ability to be a true pandemic killer and that to become more transmissible, it would necessarily have to become less dangerous.
我们的能力不减。
我们的能力不减。
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