open gear lubricant

例句：

1. 1.The engine needs an open gear lubricant to keep it running smoothly.
   发动机需要一种开式齿轮润滑油来保持其平稳运行。
2. 2.The mechanic replaced the old open gear lubricant with a new one.
   机械师用一种新的开式齿轮润滑油替换了旧的。
3. 3. The open gear lubricant helps to reduce friction and extend the life of the gears.
   这种开式齿轮润滑油有助于减少摩擦，延长齿轮的使用寿命。