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 doesn't know we've changed hotels.
她不知道我们换了旅馆呀。
Would you mind closing the window for me?
能帮我关一下窗户吗？（你介意关下窗户吗？）
I'm afraid all these offices are non-smoking offices.
恐怕这些办公室都是禁烟办公室。