1. 内曲：incurvation 内曲 | incurvature 内曲 | incurve 向内弯曲
2. 内曲率：incurvation内曲 | incurvature内曲率 | incurve内曲球
1. Concave shape, incurvation, incurvature
a。凹凸的，一面凹一面凸
noun
1. a shape that curves or bends inward
Synonym: concave shape concavity incurvation