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单词 concave
释义 concave/ˈkɒnkeiv/adj. having an outline or surface curved like the interior of a circle or sphere (cf. 参见 CONVEX) 凹的,凹面的 concavely adv. concavity /-ˈkæviti/ n.[Latin concavus (as COM-, cavus ‘hollow’), or through French concave]
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