Clients obtain a service by supplying to the service provider's GetService method the type of the service they want.
客户端通过向服务提供程序的GetService方法提供它们所需的服务类型来获得服务。
Clients obtain a service by supplying to the service provider's GetService method the type of the service they want.
客户端通过向服务提供程序的GetService方法提供它们所需的服务类型来获得服务。
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