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。
Applying new material may decrease efficiently structure mass of rocket and increase range of rocket.
采用新材料可以有效地减轻运载火箭的结构质量，增加运载火箭的射程。
Applying new material may decrease efficiently structure mass of rocket and increase range of rocket.
采用新材料可以有效地减轻运载火箭的结构质量，增加运载火箭的射程。
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