短语词组短语tangent perpendicular to radius 圆的切线tangent t to 相切tangent adjacent to switch rail 紧接尖轨的直线tangent plane to a surface 曲面的切平面Tangent to PS 相切于零件面tangent to spiral 螺旋曲线起点Tangent to Bend 与折弯相切 返回 tangent to