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
We might need you to come through with your friends, Robbie.
我们也许需要你们多邀朋友来帮忙， Robbie。
It's a pain in the neck.
那真是件麻烦事
Sally was amused, but I was very embarrassed!
萨莉感到很有趣，而我却很尴尬。