Particle moving around their atomic nucleus.

绕原子核运动的粒子。

Very high densities, close to that of an atomic nucleus.

它的密度非常高，接近于一个原子核。

So, what I'm thinking of is the universe is kind of like an atomic nucleus.

所以，我认为宇宙类似于原子核(atomic nucleus)。

NEUTRON or PROTON viewed as a fundamental constituent PARTICLE within the atomic NUCLEUS.

被视做原子核中基本组成粒子的中子或质子。

Nucleon density distribution is one of the most important characters of an atomic nucleus.

核子密度分布是原子核的一个重要性质。