concavity/kɑn.ˈkɑ.və.ˌti/复数形式concavities1凹面, 凹形曲线a shape, line or surface that is hollow and is rounded inward同义词： incurvatureincurvationconcave shape2凹面, 凹形的特性the property possessed by a concave shape同义词： concaveness