The reason for the lessened effect is the lighter density. Greater mass has greater gravitational pull.
影响减轻了的理由是更轻的密度，更大的质量会具有更大的引力牵引。
Focuses had sign of the patch shaped low-density areas and high-density plot area scattered in them. They all had mass effect in different degree.
病灶为大片低密度影内可见散在、分布不均匀的斑点或斑片状高密度影，有程度不一的占位效应。
The effect of the rise of ground water level was simulated by increasing the mass density of pore water in the soil elements between the initial and targeted ground water levels.
通过逐步改变初始和终止地下水位间土单元中孔隙水的密度模拟地下水位上升的效应。
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