这就意味着所有环绕太阳的行星都会沿切线方向飞离环绕轨道。
This means that all of the planets revolving around the sun would fly out of orbit right away.
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.
方法在切口部位，沿扩张区域局部轮廓切线的垂直方向切开，植入扩张器。
Methods in the area of incision, made a incision vertical to the tangent of local curve of expanding area, implanted the expander through this incision.
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