我写作是因为我没有其他生存的方式。

He who is not contented with what he has，would not be contented with what he would like to have.

"The past is a shadow that follows us, but it is also the light that guides us forward."

对于系统，翻版的模拟是在控制图中添加一个创建循环的边，而不仅仅是一个附加节点。