The urban highway tunnel is a component of urban underground space development .
城市公路隧道是城市开发地下空间的组成部分。
The development and utilization of urban underground space in a broad sense mean all underground facilities for utilization of urban underground space and execution of city's function.
城市地下空间的开发利用，广义上讲是利用城市地表以下的空间，发挥城市功能的一切地下设施。
The scale of development and utilization of urban underground space expands with the enhancement of urbanization and economy level in a city.
随着经济水平和城市化水平的不断提高，城市地下空间开发利用规模不断扩大。
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