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
We'll spend many more weekends like this.
我们以后可以多度几次这样的周末。
There is nothing which has not been bitter before being ripe.
事情在成功前没有不艰苦的。
Finding that he could not remember a word of the letter either,
狱卒发现自己连一个字也记不住，