Operator notation
[计] 算子表示法, 算符表示法
🧩 词语组成解析
🗣️ 情景例句
Maybe she'll call back. She promised.
也许她会打电话回来。她说了。
When is grandparents' wedding anniversary?
祖父母的结婚周年是什么时候？
But this does not matter, for, as he has often remarked, one is never too old to learn.
但这没有关系，因为正如他常说的那样，人要活到老学到老。