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
The rings, please.
请戴戒指。
An ill workman quarrels with his tools.
拙匠常怪工具差。
At the moment in my country there are very few such schools.
目前在我国这类学校太少了。