As we traverse the tree, changes are local to the current focal node, meaning all constant-time operations except for up.

遍历树时，更改是在当前关注节点的本地做出的，也就是说除了向上移动之外，所有操作都是常量时间的。

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A zipper is a way of representing a data structure with a local context, such that navigation (iteration) and modification from the current context are, for the most part, constant-time.

zippers是使用本地上下文表示数据结构的一种方法，这使当前上下文中的导航(迭代)和修改在很大程度上具有常量时间的特点。

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The current at the channel base is specified, and use two time constants can get the much better shapes than single time constant.

模型对于特定的雷电通道底部电流，采用了汉时间常数，取得了比单时间常数更好的拟合效果。

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