Coboundary operator
[计] 边缘算子
🧩 词语组成解析
[计] 上边缘
🗣️ 情景例句
Chairman Mao said it is necessary to drill as much as possible.
毛主席说，反复操练是非常必要的。
Look not for musk in dog's kennel.
狗嘴里吐不出象牙。
I want you to look at this material.
我要你看看这材料！