curvature radius of waterway

例句：

1. 1. The shape ofthe planet is determined by its curvature radius.
   行星的形状由其曲率半径决定。
2. 2. The radius of curvatureis a measure of how curved anobject is.
   曲率半径是衡量物体弯曲程度的一个指标。
3. 3. The radius of curvature affects the way light bendsaround the object.
   曲率半径影响光线围绕物体的弯曲方式。