| 释义 |
原子核yuánzǐhé原子的核心部分,由质子和中子组成。原子核只占原子体积的极小部分,而原子的质量几乎全部集中在原子核上。{atomic nucleus; nucleus; positively charged core of an atom, composed of protons and neutrons and containing almost all the mass of the atom though forming only a tiny fraction of the atomic volume} |