Quadratic variation
[计] 二次变分
🧩 词语组成解析
a. 二次的\\nn. 二次方程式
🗣️ 情景例句
Carl, you're sure you've never played?
Carl，你肯定你从来没玩过吗？
Do you want to airmail it or not?
你想发航空信吗？
Congratulations on your good news! You must have done well to have achieved this success.
对你的好消息表示祝贺。你一定是干得很出色才获得这一成功的。