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
He knows all there is to know,
他无所不知，
Silence is learnt by the may misfortunes of life.
沈默是通过生活中的许多不幸而学会的。
He had found his family, and his roots at last!
他终于找到了他的家族，他的“根”了！