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
Just three days.
只要三天。
My head has been hurting.
我头痛。
'Yes, thank you,' I answered, 'but I can't pay the bill.I haven't got my bag.'
“很好，谢谢。”我回答，“但我付不了帐，我的提包没有了。”