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Concave 考法 1】Adj.凹的 Curved Surface Sphere 例】A Lens

正面 concave
背面
【考法 1】adj.凹的: curved like the inner surface of a sphere
【例】a concave lens 凹透镜
【近】dented, depressed, dished, indented, recessed
【反】bulging, convex, protuberant 凸的

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