Variation problem
[计] 变分问题
🧩 词语组成解析
🗣️ 情景例句
But I have promises to keep,
但是我有约要赴
Fighting one's own.
起内哄。
The spheres had been magnetized and attracted or repelled each other all the time.
金属球经过磁化，互相之间不停地相互吸引或相互排斥。