Operator hierachy
[电] 算子阶组
🧩 词语组成解析
🗣️ 情景例句
He sees her often but doesn't want to get too involved.
他常与她来往，但不愿用情太深。
This isn't a laughing matter.
这种事是不能开玩笑的！
IS it true or false?
这是对的还是错的？