通常，在应用程序中使用缓存有两个原因。

Generally, you would use caching in your application for two reasons.

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在应用程序中使用数据绑定框架有一些缺点。

There are some disadvantages to using a data binding framework in your application.

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您现在应该理解在应用程序中使用它们的必要性了。

You should now have the understanding you need to use them in your applications.

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