小熊猫走钢丝

        小圆半径是大圆半径的二分之一，当小圆在大圆内做纯滚动时，小圆上一点的轨迹是一条直线。这个结论可用初等数学加以证明。本展品小圆是个外齿轮，大圆是个内齿轮，相互啮合，观众按动按钮，电机拖动小圆在大圆内滚动，可以观察到“滚出直线”的现象。

PANDA WALKING ON STEEL WTRE

        The radius of the small circle is half the radius of the large circle. The track of a point on the small circle will be a straight line when it is in a pure rolling movement within the large circle, this can be proved with elementary mathematics.

        The small circle of the exhibit is a small gear, and the large circle is an internal gear and they mesh with each other. When the batten is pressed, the motor will pull.