metal-arc cutting

例句：

1. 1. The metal-arc cutting machine is used to cut metal sheets.
   金属弧切割机用于切割金属板材。
2. 2. Metal-arc cutting technology has greatly improved the efficiency of metal processing.
   金属弧切割技术大大提高了金属加工的效率。
3. 3. In order to save time, we should use metal-arc cutting instead of manual cutting.
   为了节省时间，我们应该使用金属弧切割而不是手工切割。