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
I'm very proud of you.
我为你感到非常骄傲。
Cathy has told me so much about you.
我常常听到凯茜提到你。
The third item has been omitted.
第三项目漏掉了。