绕转之后移动方向为自南向北，也是沿圆周的切线运动。
Both of approaching and returning movements are along the tangent of the circle.
摆线逆运动中与动切线成定角的直线，其包络也是圆周渐开线。
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the…
摆线逆运动中与动切线成定角的直线，其包络也是圆周渐开线。
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the…
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