使用命令高速缓存是一个高级主题。

Using command caching is an advanced topic.

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还有许多值得一提的高级主题。

There are a number of advanced topics worthy of mentioning.

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在本文的最后部分，我们介绍了一些有关小部件编程的高级主题。

In the last part of this article, we covered a few advanced widget programming topics.

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