记住你可能在动画中要修改定点的位置，所以在你的关键帧结构体中，除了角度和长度值外，你可能还要向修改坐标值。
Also remember that you may want to change vertexes positions during the animation, so in your Keyframe structure, in addition to Angle and length fields, you may want to modify the coords values.
圣地亚哥小组很快就以10米内的误差精确定点了反射器的位置。
The San Diego team was quickly able to pinpoint the reflector's location to within 10 meters.
注意吊索的变形伸长以及吊索固定点位置应不受土体变形的影响。
Pay attention to that the elongation and fixed point position of sling should not affected by the earth body deformation.
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