The backing store is commonly a fast disk .

后备存储器通常是一个高速磁盘。

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That way, we can change the backing store without rewriting the service class.

这样，我们可以修改后台存储而不必重写服务类。

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That way, we can change the backing store without rewriting the service class.

这样，我们可以修改后台存储而不必重写服务类。

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