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
She went to a school-board meeting.
她去参加联合校董会会议了。
Though malice may darken truth, it cannot put it out.
恶意可以遮暗真理，但不能抹杀真理。
Don't you usually come to school by bike?
你不是常骑自行车到学校吗？