live rollers

例句：

1. 1. The machine has a live roller that can be adjusted to fit different materials.
   这台机器有一个可调整的活辊，可以适应不同的材料。
2. 2.The rollers are designed to reduce friction and improve the quality of the finished product.
   这些辊子被设计来减少摩擦并提高成品的质量。
3. 3. The rollers are used in various industries to smooth out surfaces and remove imperfections.
   这些辊子被用于各种行业中，用来平滑表面和去除不完美之处。