When the constructor of the host is called, the host USES the parent service provider (IServiceProvider) to construct its service container.

当宿主的构造函数被调用时，该宿主使用父服务提供程序(IServiceProvider)来构建它的服务容器。

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Because a service container can store and retrieve services, they are also considered service providers and as such implement IServiceProvider.

因为服务容器可以存储和检索服务，所以它们还被视为服务提供程序，并因此实现了IServiceProvider。

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