该手腕具有两个圆弧运动的自由度，分别由角转台和连杆机构来实现。
The new type of wrist consists of two circular tracks, which is realized by rotate mechanism and link mechanism.
一辆汽车有两个运动自由度，在司机的指引下汽车还可以向左转向右转。
A car, under the direction of its driver, has two freedoms motion, it can also turn left or right.
三个运动自由度中，每一个都有两个相反的动作。
Within each of the three freedoms of motion, an aircraft has two others.
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