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
When would we have to move?
什么时候我们得搬家？
The sky is getting very cloudy.
天空的云越来越多了。
Goodbye, Dr Zhang.
再见，张医生。