direct current electric arc furnace

例句：

1. 1.The direct current electric arc furnace is used to produce high-quality steel.
   直流电弧炉用于生产高质量的钢材。
2. 2.The direct current electric arc furnace is an essential tool for metallurgical research.
   直流电弧炉是冶金研究的重要工具。
3. 3.The direct current electric arc furnace is a complex machine that requires skilled operators.
   直流电弧炉是一种复杂的机器，需要熟练的操作员。