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 got a Dear John letter from her.
我收到她的绝交信了。
I will be baptized in a few hours from now.
我将在几个小时后受洗。
On Wednesday evening, we went to the Town Hall.
星期三的晚上，我们去了市政厅。