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
Thank you.
谢谢 。
He is playing on the merry-go-round in the park.
他正在公园里骑旋木马。
You can buy whatever you need if you have enough money.
钱多了，你需要什么就可以买什么。