Concave function
[计] 凹函数
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
🗣️ 情景例句
The little boy held his mother's hand firmly when crossing the street.
那小男孩过马路时紧抓着母亲的手。
How long will it take to have this radio fixed?
修理这收音机要多久？
A bar of Chocolate.A bottle of milk.A pound of sugar.
一块巧克力、一瓶牛奶、一磅糖、