rotary off-normal spring

例句：

1. 1. The machine isdesigned to rotate the parts in a circularmotion.
   这台机器设计成使部件以圆周运动旋转。
2. 2. Therotary valve is usedto control the flow of gases.
   旋转阀用于控制气体的流动。
3. 3. The rotary saw has a sharpblade that can quickly cut through wood.
   旋转锯有一个锋利的刀片，可以迅速切割木头。