double-slag operation

例句：

1. 1.The double-slag operation is an important step in the process of steelmaking.
   双渣操作是钢铁生产过程中的一个重要步骤。
2. 2. During the double-slag operation, the molten metal is forced to flow through a gap between two walls.
   在双渣操作期间，熔化的金属被强制通过两个壁之间的间隙。
3. 3. The double-slag operation helps to reduce the amount of slag and improve the quality of the steel.
   双渣操作有助于减少渣量并提高钢铁的质量。