noun 下载 🔗分享 质子 A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark. Examples : "The hydrogen atom has only one proton in its nucleus. " 氢原子核内只有一个质子。 physics element chemistry science 与AI对话词汇游戏阅读练习