Look back on the past, space exploitation is very brilliant.
回顾过去,空间开发成就卓著。
Underground space exploitation on a large scale in city will bring a mass of discarded soil.
城市地下空间的大规模开发利用将产生大量弃土。
Space exploitation is one of the most important areas in human's activities in the 21st century.
空间开发是2 1世纪人类活动最重要的领域之一。
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