凹 ao ˉ
(Concave, Dented, Depression, Hollow, Indentation)
Concave, Dented, Depression, Indentation, Hollow
凹面鏡
ao ˉ mianˋ jingˋ
(Concave)
Concave mirror
Cat: Math-Science-Optics (Concave mirror) Next
rhymes-凹面鏡
Fragment (中文 to English)
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