More than just a component of reusable code, a service is part of a running program that can be invoked by a client without having to incorporate the code itself.
服务不仅是可复用代码的组件，更是运行程序的一部分，客户端可以不必合并它自己的代码直接调用该程序。
More than just a component of reusable code, a service is part of a running program that can be invoked by a client without having to incorporate the code itself.
服务不仅是可复用代码的组件，更是运行程序的一部分，客户端可以不必合并它自己的代码直接调用该程序。
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