- 内: inner; inside; within
- 曲率: curvature; buckling; curvity
- 内曲: incurvation; incurvature; incurve; inturn; re-entrant
- 曲率: [数学] curvature; buckling; curvity◇曲率计 curvimeter; flexometer; 曲率角 angle of curvature
- 内曲柄: inside crank
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