This is the staircase of the hotel, under is jet black, It is an artificialbasin actually, It looks like has the return natural flavor.
这是酒店大厅的楼梯…下面黑洞洞的，其实是一个人工水池，看起来有回归自然的味道。
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Surface water-mostly rivers, lakes and reservoirs-will not flow from one basin into another without artificial diversion, and usually only with pumping.