齿轮副是这样建立的 1/3 选择定义齿轮副连接，选择new，输入名字； 选择齿轮的连接轴（JOINT AXIS）,在这个例子里，连接轴就是昨天运动干涉里提到的驱动轴； 下面这个body和ground,意思是定义齿轮运动。
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universal joint axis 万向接轴
pin axis joint 销轴节点
Axis and Atlas joint 寰枢关节
single-axis knee joint 单轴膝关节
ring-axis joint 环枢关节
Axis-position joint 轴位置关节表示法
weak axis dogbone joint 弱轴狗骨式节点
motor axis of the joint 关节运动轴
If your foot is at a right Angle to your outstretched leg and does not dangle, you have a low ankle-joint axis and will be more comfortable in flat shoes than in high heels.
如果你的脚和你伸直的腿成直角，且没有晃荡，那么说明你有一个较低的踝关节，你穿平底鞋会比穿高跟鞋更舒适。
The universal joints are the very important components in mechanical engineering, and as the effect of stress concentration, the fork of the joint axis and the flat head are often damaged.
万向连接轴是许多工程机械的传动连接部件，由于应力集中的影响，连接轴的叉头和扁头经常发生破坏现象。
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