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
Make yourself at home.
不要客气。
He will always be a slave who knows not how to earn and save.
不懂挣钱和积财，只能永远当奴才。
Just then, the gaoler appeared with the precious letter in his bands.
这时狱卒上场，手里拿着那封珍贵的信。