In physics it is an identification of material by noting its mass per unit volume.
在物理学上，是以每单位体积的质量来鉴别物质。
Porous solid mass is an important material base in the formation of debris flow.
松散固体物质是泥石流形成的重要物质基础。
Porous solid mass is an important material base in the formation of debris flow.
松散固体物质是泥石流形成的重要物质基础。
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