由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
经过净化的水靠重力流到地下室的另一个集水箱里。
The purified water then descends by gravity to a basement holding tank.
经过净化的水靠重力流到地下室的另一个集水箱里。
The purified water then descends by gravity to a basement holding tank .
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