screw gear

例句：

1. 1. The car has a screw gear in the engine.
   这辆车的引擎里有螺旋齿轮。
2. 2. The machine uses a screw gear to turn its wheels.
   这台机器使用螺旋齿轮来转动它的轮子。
3. 3. The screw gear is responsible for transmitting power from the engine to the wheels.
   螺旋齿轮负责将发动机的动力传输到车轮上。