wedge gear

例句：

1. 1. The car has a wedge gear that makes it easy to start in the cold.
   这辆车有一个楔形齿轮，使得在寒冷中启动变得容易。
2. 2.The wedge gear is responsible for transmitting power from the engine to the wheels.
   楔形齿轮负责将发动机的动力传输到车轮上。
3. 3. The wedge gear was designed to improve efficiency and reduce wear on the transmission.
   楔形齿轮的设计旨在提高效率并减少传动系统的磨损。