grain slag

例句：

1. 1.The factory produces a lot of grain slag, which is used as fertilizer.
   这家工厂生产大量的粮食渣滓，用作肥料。
2. 2. The farmers use the grain slag to enrich the soil for their crops.
   农民们使用粮食渣滓来丰富土壤，以供他们的作物生长。
3. 3. The grain slag was considered a waste product until it was discovered that it could be used as a source of energy.
   粮食渣滓最初被认为是一种废物产品，但后来发现它可以作为一种能源的来源。