Variation problem
[计] 变分问题
🧩 词语组成解析
🗣️ 情景例句
But, my dear niece, please do consider my words very carefully before you decide.
但是我的孩子，在你做出决定之前请一定要认真考虑我的话。
I can't express myself very well in English.
我不能很好地用英语表达自己。
In the letter he was asked to call at the station.
要他到警察局去一趟。