With a little more effort, I can express a binary tree — a tree with each node holding a value and exactly two branches. A simple binary tree in Haskell looks like this.

只要多付出一点功夫，就能表达b树——b树的每个节点都容纳一个值和两个分支。

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This is a simple binary tree class that I wrote while writing a PDA program.

这是一个简单的二进制树类，我在写一写掌上电脑程序。

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