Rattleback
- 回旋陀螺（回旋陀螺是一个半椭圆形的陀螺，会往特定方向旋转，但被往反方向转时会变得不稳定，停止后又转回原方向）
咔哒背甲兽(Rattleback)-五百万年后
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Rattleback
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abstract:
A rattleback is a semi-ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles", stops and reverses its spin to the preferred direction.
以上来源于:
WordNet
