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1. Oxford American Dictionary

   concave

   • IPA[ˈkänˌkāv]

   美式

   • adj.
     having an outline or surface that curves inward like the interior of a circle or sphere
2. • 釋義

   adj.

   形容詞

   • 1. having an outline or surface that curves inward like the interior of a circle or sphere concave lenses