If the cache entry was revalidated after the cache synchronization date and there are no server revalidation requirements that make the cached entry invalid, the entry from the cache is used.
如果缓存项的重新验证日期比缓存同步日期晚，而且没有使缓存项无效的服务器重新验证要求，则使用缓存中的项。
If the cache entry was revalidated after the cache synchronization date and there are no server revalidation requirements that make the cached entry invalid, the entry from the cache is used.
如果缓存项的重新验证日期比缓存同步日期晚，而且没有使缓存项无效的服务器重新验证要求，则使用缓存中的项。
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