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 think all the products are going to sell very well.
我相信这批货一定会卖得很好。
I'm going home.
我正要回家。
This box is big.
这是个大盒子。