If the cached data are location-dependent data, then with the client changing its location, the cached data value may become invalid, so deciding the validation of the cached data is very important.

如果所缓存的数据是位置相关数据，那么，随着客户端位置的改变，所缓存的数据值可能变得无效了，因此，对所缓存数据值进行有效与否的判别至关重要。

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