An easement is a segment of a spiral that provides a smooth transition between tangents and curves, and curves of different radius.
介曲线是一组用来保证在直轨和弯道之间，以及不同半径的弯道之间进行平稳过渡的螺旋线。
An easement is a segment of a spiral that provides a smooth transition between tangents and curves, and curves of different radius.
介曲线是一组用来保证在直轨和弯道之间，以及不同半径的弯道之间进行平稳过渡的螺旋线。
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