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
If you want to go sightseeing, a ferry trip is usually pretty cheap.
如果你想观光，坐船通常是比较便宜的。
I'm so sorry.
十分抱歉！
The radio says that it may stop raining later.
广播说晚些时候雨可能会停。”