Both functions walk the tree in depth-first order but they differ in whether a node is visited before or after its children.
这两个函数均按照深度优先的顺序遍历树，但两者的差异在于先访问一个节点还是先访问其子节点。
In order to understand how Business Space functions, you first need to understand what a widget is.
为了了解业务空间是如何工作的，您首先需要了解什么是小部件。
Specifically, functional programming languages must provide high-order and first-class functions, which this article defines.
特别地，函数式编程语言必须提供高阶和一流的函数，这是本文所定义的。
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