Nucleon number
核子数，质量数
🧩 词语组成解析
n. 核子\\n[化] 核子
🗣️ 情景例句
you used to be in the construction business.
你过去在建筑界工作。
Are you sure?
你确信吗？
How long has Kate been at her school?
凯特进校学习有多长时间了？