The callback function accepts the challenges from the server, sends them to the user, brings back the responses to those challenges, and passes the responses to the server.
这个回调函数接收来自服务器的询问，将它们发送给用户，取回对这些询问的响应，将响应发送给服务器。
The callback function accepts the challenges from the server, sends them to the user, brings back the responses to those challenges, and passes the responses to the server.
这个回调函数接收来自服务器的询问，将它们发送给用户，取回对这些询问的响应，将响应发送给服务器。
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