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。
我一直都承认是我的热情在控制着我。
Loneliness is not lack of company, loneliness is lack of purpose.
真相很少是纯粹的,也绝不简单。
Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend.