bevel gear with 90° face angle

例句：

1. 1.The machine uses a bevel gear to turn the screws.
   这台机器使用楔形齿轮来转动螺丝。
2. 2. The car has a bevel gear that makes it easier to change gears.
   汽车有一个楔形齿轮，使换挡更容易。
3. 3. The bevel gear is designed to reduce friction and improve efficiency.
   楔形齿轮被设计来减少摩擦并提高效率。