A service is a callable routine that is made available over a network.
服务是能够通过网络访问的可调用例程。
If a callable object is given, it ACTS as a callback for a match.
如果给出的是一个可调用对象，它就像匹配的回调函数一样工作。
How this value is computed depends on the type of the callable object.
这个值如何计算依赖于可调用对象的类型。
How this value is computed depends on the type of the callable object.
这个值如何计算依赖于可调用对象的类型。
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