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
You didn't say the magic words.
你没有念魔语。
The tortoise wins the race while the hare is sleeping.
兔子睡大觉，乌龟跑第一。
It was not that Bruce always underestimated difficulties.
这并不是说布鲁斯总是低估困难，