Concave polygon
n. 凹多边形
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
polygon
['pɔligən]
n. 多边形，多角形;龟裂状;
🗣️ 情景例句
You must've come home very late.
一定很晚才回家。
How do you spend your evenings?
夜生活你都是怎么过的？
I can't get home so early, Dad!
这么早我到不了家，爸爸！