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例句：

1. 1.The factory produces high-quality steel by using this special slag.
   这家工厂通过使用这种特殊的矿渣生产出高质量的钢材。
2. 2.The engineer analyzed the slag composition to improve the efficiency of the process.
   工程师分析了矿渣成分以改进工艺的效率。
3. 3.The slag was then used as a fertilizer in the fields.
   然后，矿渣被用作田地的肥料。