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
This is a wonderful example of Spanish-style architecture.
这是栋很棒的典型西班牙式建筑。
A brave retreat is a brave exploit.
勇退即勇绩。
I am only interested in sitting in a boat and doing nothing at all!
我感兴趣的只是独坐孤舟，无所事事！