(of an outline or a surface 轮廓或表面 curving in 凹的；凹面的 a concave lens/mirror 凹透镜；凹镜 The upper surface is slightly concave. 上表面略凹。 The inside of a shiny spoon is a common example of a concave mirror. 光亮的调羹内层就是一种常见的凹镜。
Oxford Collocations DictionaryConcave is used with these nouns:- mirror
Word Originlate Middle English: from Latin concavus, from con- ‘together’ + cavus ‘hollow’.
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