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
clip it around under your collar.
将它夹在领子下方。
Hey, you forgot about me! Don't leave me here!
喂，你把我给忘记了！别把我对丢在这里！
There was also a great deal of machinery on display.
参展的还有很多机器，