Underground space is a new resource of urban construction.
地下空间是城市建设的新型国土资源。
Until now, the 21st century has over ten years, as a natural resource, the urban underground space has obtained more extensive attention from human.
到现在，21世纪已经过去了十年，正如所说的那样，作为自然资源而存在的城市地下空间，已经得到了人类日益广泛的重视。
Until now, the 21st century has over ten years, as a natural resource, the urban underground space has obtained more extensive attention from human.
到现在，21世纪已经过去了十年，正如所说的那样，作为自然资源而存在的城市地下空间，已经得到了人类日益广泛的重视。
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