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
She's an easy-going teacher.
她是位随和的老师。
Time past never returns, amoment lost, lost for ever.
过去的时间决不返回，浪费一点，永远消失。
She's sitting under the tree.
她正在树荫下坐着。