词组、短语、俚语及习惯用语• Packing void fraction
填料(层)空隙度。• fraction collection trap
馏分收集阱。• fraction defective
不良率,不合格率,废品率。• fraction gear
组合齿轮。• fraction numeral
分数数词。• fraction of sample in gas phase
试样在气[液]相中所占分数。• fraction of sample in liquid phase
试样在气[液]相中所占分数。• fraction stroke
分数线。• packing agent
渗碳剂。• packing and labeling regulations
包装与标签规定。
packing fraction
packing-fraction的词性：
n.Physics （名词）【物理学】
1. The quotient of the algebraic difference between the isotopic mass and the mass number of a nuclide, divided by its mass number, often interpreted as a measure of stability.
敛集率，聚集率：核素的同位素量和质量数之间的差额被它的质量数除所得到的商，通常被看作是测量稳定性的标准
