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
worrying about him.
为他操心。
The wire has got crossed.
电话串线了。
Come on, Wu! shouted the Class 1 students. Oh! Bad luck!
“快！快呀！吴鹏！”1班的学生喊道，“啊！真倒霉！”