It iterates over the same set of Integer keys for the HashMap storing new BinaryTree structures, which are simply fully populated 15-level BinaryTrees.

它为存储新BinaryTree结构的hashmap迭代一组相同的integer键，这些结构是完全填充的15级BinaryTrees。

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For example, you can declare an enumeration for a set of integer constants associated with the days of the week, and then use the names of the days rather than their integer values in your code.

例如，您可以宣告列举来当做一组与每周日期关联的整数常数，接著在程序码中使用日期的名称而不是它们的整数值。

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Recall from the discussion in the first article of this series that whenever I want to use multi-byte integer format, I must set the leftmost bit of the first length byte to 1.

回想在本系列第一篇文章中的讨论，在希望使用多字节整数格式的时候，必须将第一个长度字节的最左边一位设置为1。

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