因此，课程不是预先指定的。
您需要创建一个服务器套接字，接收预先指定地址的连接。
You need to create a server socket that can accept connections at a predefined address.
他们证明了产生单值群的变换可以任意地预先指定。
They showed that the generating transformation of the monodromy group can be prescribed arbitrarily.
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