恒星：在每个阶段，由于重力与外向力的作用，作品都会产生结构变化。
这是一组占用了一定空间的元件，从它们的结构来看，这些元件具备一些共性。
Stellar: At each stage the gravitational forces and the forces toward the outside makes structure changes.
A set of elements occupying a space and having similar properties arising from their similar structure.