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
What year are you?
你是哪一级的？
Why didn't you like cleaning house so much?
为什么你那么不喜欢清理房子？
The third person who lit a match started the fire.
第三个工人擦亮一根火柴就引发了火灾。