down milling

例句：

1. 1. The machine is designed for down milling operations.
   这台机器是为下料加工设计的。
2. 2. Down milling is a process used in the manufacturing of metal parts.
   下料是一种用于金属部件制造的过程。
3. 3. In down milling, the material is cut to the desired size and shape before being assembled into largerpieces.
   在下料过程中，将材料切割到所需尺寸和形状，然后组装成较大的部件。