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
You'll never be in shape until you eat less and exercisemore.
只有少吃多锻炼才能健美。
Hardships never come alone.
祸不单行。
the man sadly picked up the mattress and carried it into his house.
伤心地捡起了床垫，把它拿进了屋。