slag sand

例句：

1. 1. The factory uses a lot of slag sand to produce its products.
   这家工厂使用大量的废渣砂来生产产品。
2. 2.The engineer was asked to test the slag sand for strength.
   工程师被要求测试废渣砂的强度。
3. 3.The construction company used slag sand as a substitute for sand for their concrete mix.
   建筑公司用废渣砂作为混凝土混合物的替代品。