Concave line
[计] 凹线
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
line
[laɪn]
n. 线条;排;行列;界线;
vt. 排队;用线标出;沿…排列成行;给…安衬里;
vi. 形成一层;排队;击出平直球;
🗣️ 情景例句
Where are we going to be?
我们会在哪儿？
The moon is not seen where the sun shines.
小巫见大巫。
He took off the first shoe and threw it on the floor.
他脱下第一只鞋子，把它丢在地板上。