Concavo-concave
a. 两凹的, 两面凹洼的\\n[建] 两面凹的
🧩 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
Where's the nearest flea market?
最近的跳蚤市场在哪儿？
How much is the admisssion fee?
入场费要多少钱？
Well, it feels strange to have a twin sister.
是呀，有个孪生姐姐是觉得奇怪。