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
Well, we'll phone every hour,
好了， 我们每个小时都打电话
How much is the interest a year?
每年利息多少？
I would like to ask you about some stamps.
我想问问有关一些邮票的事。