Raw data providers are not sufficient for data that is always changing, because the components do not receive notification of data changes.
原始数据提供程序不能满足经常改变的数据的需求，因为组件不能收到数据变更通知。
The client library provides caching, event notification, and other features that make the API more convenient to use than the raw service interface.
客户端库提供缓存、事件通知和其他使得该 API 比原始服务接口更易于使用的功能。
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