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
Come on, you can make it.
振作起来，你一定行。
He that lives well is learned enough.
生活好者，博学多才。
Has he had anything to eat this morning?
他今早吃了什么东西吗？