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
We'll call on him in any case.
无论如何，我们都要去拜访他。
I give you my word for it.
对于此事我向你保证。
He waited until the volcano became quiet and he was able to return two days later.
他等到火山平静下来，两天以后又返回去。