因为我自己正在构建一个类，所以我需要显式地创建默认构造函数。
Because I'm building a class myself, I need to explicitly create the default constructor.
主要的注意点是添加了一个显式构造函数。
The main thing to notice is that you have added an explicit constructor.
作为回显服务，此函数把“yousaid…”写回客户端。
As an echo service, the function writes "you said..." back to the client.
作为回显服务，此函数把“yousaid…”写回客户端。
As an echo service, the function writes "you said..." back to the client.
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