Coboundary operator
[计] 边缘算子
🧩 词语组成解析
[计] 上边缘
🗣️ 情景例句
Learning any language takes a lot of effort.
学习任何语言都需要花费很多努力。
What's the size of your shoes?
你的鞋多大尺寸？
But this was before Annie Sullivan came to stay.
但是，这都是安妮·莎利文来住下之前的事了。