Quadratic variational problems
[计] 二次变分问题
🗣️ 情景例句
I know. But we're going to be late for dinner.
我知道。但我们晚餐可要迟到了。
I will get it from my friend.
我会从我的朋友那里得到它。
There are eighteen floors in the building, and he lives on the fifteenth floor.
这幢大楼有18层。他住在第15层。
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