left-hand spiral bevel gear

例句：

1. 1.The left-hand spiral bevel gear is used in the transmission system.
   左螺旋锥齿轮用于传动系统。
2. 2. The left-hand spiral bevel gear is crucial for the smooth operation of the machine.
   左螺旋锥齿轮对于机器的平稳运行至关重要。
3. 3.The left-hand spiral bevel gear has a high precision and can reduce noise significantly.
   左螺旋锥齿轮具有高精度，可以显著降低噪音。