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
It's no use crying over spilt milk. What's done cannot be undone.
覆水难收。
In regard to your request, no decision has been made.
关于你的请求还没有做出决定。
No, we must stay here and find our lunch.
“不，我们必须留在这儿并找到我们的午饭！”