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 not an overstatement. As I said, these are only the main ones. There are many others.
你这样说一点也不夸张，我只是说了几个重要的节日，还有很多没有提及呢。
A bad compromise is better than a good lawsuit.
吃亏的和解也比胜诉强。
Then the cannons of the anchored warships thundered a salute to which the Vasa fired in reply.
这时，停泊在港口的其他战船向瓦萨号鸣炮致礼，瓦萨号也鸣炮回礼。