Unfortunately, swine flu's infectiousness and the globalized flow of human travel make for a very dangerous combination.
不幸,流感传染性和人员流动全球化形成了一个非常危险组合。
Unfortunately, swine flu's infectiousness and the globalized flow of human travel make for a very dangerous combination.
不幸,流感传染性和人员流动全球化形成了一个非常危险组合。
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