By moving certain facilities and function underground surface land in urban areas can be used more effectively thus freeing space for agricultural and recreational purpose.
通过将特殊器材设备置于地下，城市地表可被更有效地利用，这样就可释放出空间供农业和娱乐使用。
Water skiing is a surface water sport and recreational activity.
水上滑板是一种水面上的体育运动也是一种消遣娱乐的活动。
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