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
International travel involves a lot of waiting around in airports.
经常在机场等候是环球旅行的一部分。
How long will the flight be delayed?
班机诞误多长时间？
What do I have to do if I want to be thinner?
如果我想瘦一点的话，我得怎么做呢？”