Concave mirror
凹镜
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
🗣️ 情景例句
That's a little more than we had planned.
这比我们计划的多了一些。
How many are there in your family?
在你的家庭有多少人？
We need to make some changes in this contract.
这份契约有几个地方需要修改。