slag portland cement

例句：

1. 1. The factory produces a lot of slag for the construction industry.
   这家工厂为建筑业生产大量的废渣。
2. 2. The slag was used to make bricks and tiles.
   这些废渣被用来制作砖块和瓷砖。
3. 3. The slag is a waste product that needs to be disposed of properly.
   废渣是一种需要妥善处理的废物产品。