在这个实例中，高速缓存系统是自清除种类的。
In this instance, the cache system is of the self-pruning variety.
在正常情况下，版本编号系统，可免除使用了过时的缓存，但它仍然是明智的清除它更新时下载了。
Under normal circumstances, the version numbering system will prevent an outdated cache from being used, but it is still wise to clear it when updates were downloaded.
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