Plano-concave
a. (透镜)平凹的
🧩 词语组成解析
a. （透镜）平的
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
🗣️ 情景例句
I read when I have the chance.
我有空时喜欢读书。
We're having a little get-together Friday night.
周五晚上我们有个小派对。
Just the weekend. Well, I must be off. See you when I get back.
只呆这个周末。好啦，我得走了。回来再见。