Variation problem
[计] 变分问题
🧩 词语组成解析
🗣️ 情景例句
It's not a bad plan.
这是个不错的计划。
A girl looks at herself in the mirror.
女孩注视着映在镜子中的自己。
On arriving in England, they were taken to the Crystal Palace by train.
一到英国，火车就把他们送到了水晶宫。