Exploiting underground space resources and constructing subway is an effective way to solve the traffic jam problem in cities.
开发地下空间资源，建设地铁是解决城市交通拥挤的有效途径。
Compared with big cities, no sufficient attention is paid to the importance of exploiting and utilizing underground space resources in Chinas medium-sized cities.
和大城市相比，我国数量众多的中等城市对开发利用城市地下空间资源的重要性还没有引起足够的重视。
Takes underground spatial the resources attribute, cannot merely regard it as "the substitution" of the ground space, the underground spatial theory and the practice are worth us earnestly studying.
重视地下空间的资源属性，不能仅仅将其视为地面空间的“替代”空间，地下空间的理论和实践也值得我们认真研究。
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