metric-technical unit of mass [力] 质量的米制技术单位
fundamental unit of mass 基本质量单位
unit mass of material 单位质量的物质
number of mass transfer unit 传质单元数
Unit mass of the substance 单位质量的物质
height of mass transfer unit 传质单元高度
The insects generally produced less methane, nitrous oxide and ammonia both per unit of body mass and per unit of mass gained than pigs or cattle.
通常情况下，同猪和牛相比，每单位体重或增加每单位体重，昆虫产生更少的甲烷、一氧化氮和氨气。
Central to the concept of economies of scale is the idea that the best way to achieve high efficiency, and hence low unit costs, is through the mass production of a standardized output.
规模经济的中心思想就是为达到高效率从而降低单位成本，而进行的通过标准化批量生产所采用的最佳方法。
So I have one mass of unit 1-- - I will tell you what that is-- and I bang that into number 2.
现在规定一单位的质量-,我会告诉你这是什么-,使它与物体2相碰。
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