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
You want to play charades?
你想玩哑谜？
No. I went to California for a few weeks.
没有。我上加利福尼亚去了几个星期。
How time files! More than a week has passed already!
光阴似箭！已经过了一周多时间了！