When we withdraw into underground dwellings, the surface ground now occupied by cities can be turned over to park and to wilderness for recreation.
当我们撤到地下居所时，现在由城市占据的地面便可让位于公园和荒野，供人们休闲娱乐。
When we withdraw into underground dwellings, the surface ground now occupied by cities can be turned over to park and to wilderness for recreation.
当我们撤到地下居所时，现在由城市占据的地面便可让位于公园和荒野，供人们休闲娱乐。
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