要实现对转动机器人的精确控制，必须进行高精度的角位置检测。
A shaft position coder is necessary in order to control the rotary robot precisely.
髋和上身一起转绕着脊柱进行转动，脊柱与球的相对位置不变。
The hips and body are turning around and not away from the ball.
现在把一个一分钱硬币放到唱片中心附近的一个标记位置，唱片将继续转动，而一分钱则保持不动。
Never mind. Now put a penny somewhere on the label near the center.
然后我把它拿开，它开始转动来寻找它的位置。
And then when I leave it, if you look it turns to find its position.
然后我把它拿开，它开始转动来寻找它的位置。
And then when I leave it, if you look it turns to find its position.
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