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。
Modern urban business district is the key area of underground space development and utilization.
现代城市商务区是城市地下空间开发利用的重点地区。
Modern urban business district is the key area of underground space development and utilization.
现代城市商务区是城市地下空间开发利用的重点地区。
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