1. consisting of great mass; containing a great quantity of matter. 
   由质量很大的东西组成；含有很大的事物数量。
2. (quantifier used with mass nouns) great in quantity or degree or extent. 
   （与物质名词连用的量词）在数量、程度或范围上巨大的。
3. The smallest quantity of liquid heavy enough to fall in a spherical mass. 
   一滴重量足够以滴形体落下的最小量液体
4. quantifier; used with either mass nouns or plural count nouns to indicate an unspecified number or quantity. 
   数量词；既可用于复数名词也可用于复数计数名词以表明不确指的数或量的。
5. The maintenance of a physical quantity, such as energy or mass, during a physical or chemical change. 
   守恒在物理或化学变化过程中能量或质量等物理数量的维持原状

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