The name "zipper" refers to moving up and down the tree like a zipper, with the part above the focal node as the open part of the zipper and the local state as the closed part.

“ zippers ” 这个名称表示像拉链一样沿树上下移动，将关注节点上方的部分作为 zippers 的开口部分，本地状态作为闭合部分。

youdao

Zipper missing name-brand logo?

拉链缺少名牌标志？

youdao

The pull-tab zipper was long and it had my name on it.

FORBES: Dear Nike: I Can't Tie My Shoes