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
Do you accept credit cards?
你们接受信用卡吗？
It's faster to go by plane than by boat.
和坐船比，坐飞机是更快的。
'Whatever are you doing up here Bill?' asked the vicar in surprise.
“你究竟在这上面干什么，比尔？”牧师惊讶地问。