mass number [核] 质量数 ; 多数
atomic mass number [物] 原子质量数
odd mass number 奇质量数
even-mass number 偶质量数
mass number a 质量数a
low mass number 低质量数
air-mass number 大气质量数
preselected mass number 预选质量数
air mass number 气团数目
uneven mass number 不均匀质量数
All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
给定元素的所有同位素都含有相同的质子数,但它们的中子数不同,因此它们的原子质量也不同。
I had gained weight in the form of muscle mass, but thinking only of lowering the number on the scale, I altered my training program.
肌肉量增大,我的体重就增加了,但因为只想着降低体重称上的数字,我改变了训练计划。
The number of mass shooting in the US has quickly increased in recent years.
近年来,美国的大规模枪击事件迅速增加。
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