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
That's my boy!
好儿子！
Their stories are in conflict with each other.
他们的叙述相互矛盾。
The bird covered the distance in three minutes.
这只鸟只用了3分钟就飞完了全程。