speed reduction gear box

例句：

1. 1.The car's speed reduction gear box is designed to reduce the vehicle's speed when driving on steep grades.
   汽车的减速齿轮箱设计用来在陡峭坡度上驾驶时降低车速。
2. 2. The engineer used a special tool to remove the old gear box and install the new one.
   工程师使用特殊工具来拆卸旧的齿轮箱并安装新的。
3. 3. The speed reduction gear box was installed in the transmission, which significantly improved the car's performance.
   减速齿轮箱安装在变速器中，这显著提高了汽车的性能。