A virus presently located in a remote rain forest could, by means of air travel, be in a major city by this time tomorrow. We now live in such crowded cities that the scope for transmission of a virus which travels through air is greater than ever befo

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A virus presently located in a remote rain forest could, by means of air travel, be in a major city by this time tomorrow. We now live in such crowded cities that the scope for transmission of a virus which travels through air is greater than ever before.

我们现在生活的城市人口这么拥挤,病毒在空气中传播的范围比以往任何时候都要大的多。 

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