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
I go to brunch every Sunday.
我每星期天早午餐合吃。
Nothing for nothing.
不费力气，一无所得。
It is our permanent principle that contracts are honored and commercial integrity is maintained.
重合同、守信用是我们的一贯原则。