英语词汇mass number怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	mass number
释义	mass numbern.（名词） The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number 质量数：原子核中质子和中子的总数也作 nucleon number
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