lubei

例句：

1. 1. The car needs to be lubed before it starts.
   汽车在启动前需要加润滑油。
2. 2. He used a lubei to make the screws turn more smoothly.
   他用一种润滑油使螺丝转动得更顺畅。
3. 3. Lubei is essential for maintaining the smooth operation of machinery.
   润滑油对于保持机械运转顺畅至关重要。