The congested traffic has become a serious problem for many cities with their steadily increasing population, and the construction of subways is viewed as an effective solution to the problem.
随着城市人口的不断增加，许多大城市都存在交通拥挤问题，而修建地铁又是非常有效的解决方法。
The congested traffic has become a serious problem for many cities with their steadily increasing population, and the construction of subways is viewed as an effective solution to the problem.
随着城市人口的不断增加，许多大城市都存在交通拥挤问题，而修建地铁又是非常有效的解决方法。
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