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.
【正确答案】：
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。 
【题目解析】：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。注意such that的翻译。