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
First, they have an excellent School of Journalism.
首先 ，那儿有个很优秀的新闻研究所。
No, I can't go to bed till she says Good night to me.
不，除非她向我道晚安，不然我睡不着。
their parents were paying the price for fame.
他们的父母却为这名声付出了代价，