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
and you care about me
和我
He hasn't answered my letter yet.
他还没有给我回信。
Check the prices before you decide whether to buy one.
先把价格核对一下，再决定该不该买。