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'm sorry I'll have to pass.
很遗憾我得错过这回了。
I'm going to work.
我去上班。
He was late again. It's typical of him to keep everybody waiting.
他又迟到了。他的特点就是让别人等他。