重力变化的主要原因是过量开采地下水，使含水系统压密，从而导致地面重力变化。
The main cause of the gravity variation is that groundwater has been over mined, thus, hydrous system is so pressed that ground gravity varies.
对含酚污水污泥重力浓缩性能的研究表明：污泥沉降属于成层沉降和压密沉降状；
The gravity thickening property of sludge from phenol contaminated wastewater was described. It showed that the sludge settling was in layered and compression settling statues.
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