Concave mirror
凹镜
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
🗣️ 情景例句
This will make a nice gift for Marilyn and Richard.
这是给Richard和Marilyn的一件好礼物。
Let's call it a day.
我们今天就到这儿吧。
It's a pity I didn't think of it earlier.
很可惜，我没有早一点想起这事来。