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
Why don't you want to play?
你为什么不玩？
All right. Should I take a look at your battery?
好的。要不要检查一下蓄电池？
After a long period of rain the river may overflow its banks.
久雨这后，河水会泛滥成灾，