它是一个通信的仿真，就是说我们在一个通信系统中，有用户离开系统，有用户进入系统，这个程序就是用来模拟现实的通信系统，并计算用户被拒绝接入的概率-It is a communication simulation, means that we are in a communication system, the user leaves the system, users enter the system, this program is used to simulate the real commu