所有的焊接点都在同一平面内。
开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。
So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.
说明：运动方向与软管轴线应在同一平面内，以避免产生扭曲损坏。
Direction of movement and hose axis muse lie in one plane to avoid torsion stress.
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