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在陀螺的边缘粘上一枚硬币, 它的旋转轴就会发生改变。现在有证据表明, 对于地球而言, 类似的情况可能出现了不止一次。我们知道, 地球自转的轴称为地轴, 地轴与地球表面的交点称为地极。地质学家推测地轴在缓慢移动, 地极也会有微小的变化。
A coin is attached to the edge of the gyro and its axis of rotation changes. There is now evidence that a similar situation may occur more than once for the Earth. We know that the axis of rotation of the Earth is called the Earth's axis and the intersection of Earth's axis with the Earth's surface is called the Earth's pole. Geologists speculate that the earth's axis moves slowly, and the earth's poles change slightly.