pillow block for ball bearing

例句：

1. 1.The pillow block is a small cushion that you can use to prop up your head while sleeping.
   枕头块是一个你可以用来在睡觉时支撑头部的小垫子。
2. 2. The pillow block was designed to provide comfort and support for people with back pain.
   这个枕头块是为了给有背痛的人提供舒适和支持而设计的。
3. 3. The pillow block was a popular choice among travelers who needed a comfortable place to rest their heads.
   这个枕头块是旅行者中受欢迎的选择，因为他们需要一个舒适的地点来休息他们的头。