Quadratic variational problems
[计] 二次变分问题
🧩 词语组成解析
a. 二次的\\nn. 二次方程式
a. 变异的
n. 问题；难题（problem的复数）
🗣️ 情景例句
Or at least give him some advice.
再不然至少可以给他一些忠告。
The ground around here is stony and not very good for farming.
在这里附近的地多石做为耕作不很好的。
Nigel is a very lucky man.But his wife isn't very lucky.She usually stays at home!
奈杰尔是个很幸运的人。但他的妻子运气不很好。他总是呆在家里！