line smoothing

例句：

1. 1. The engineer used a special tool to line smooth the surface of the metal.
   工程师使用一种特殊的工具来平整金属的表面。
2. 2.During the manufacturing process, line smoothing is crucial for product quality.
   在制造过程中，线平滑处理对于产品质量至关重要。
3. 3.The company has implemented a new line smoothing technology to improve efficiency.
   该公司已经实施了一种新的线平滑技术来提高效率。