inside and outside grinding

例句：

1. 1. The engineer used inside and outside grinding techniques to improve the machine's efficiency.
   工程师使用内部和外部研磨技术来提高机器的效率。
2. 2.During the manufacturing process, inside and outside grinding is essential to ensure the product's quality.
   在生产过程中，内部和外部研磨是确保产品质量的关键。
3. 3. The company has invested in advanced equipment for inside and outside grinding, which significantly reduces production costs.
   该公司投资了先进的设备进行内部和外部研磨，这显著降低了生产成本。