自动缓存到文件选项可能会造成性能问题，因为它本身不支持筛选和排序。
The automatic cache-to-file storage option can result in performance issues because it does not have native support for filtering and sorting.
我还解释了针对关系的Objectify方法并展示其查询界面，其支持筛选和排序的GAE概念。
I also explained Objectify's approach to relationships and demonstrated its query interface, which supports the GAE notions of filtering and sorting.
有一个新选项支持元素筛选器，可以隐藏筛选器中除指定元素以外的元素，如图22所示。
A new option enables element filters that hide elements except the ones specified in the filter, as shown in Figure 22.
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