pond sludge used as manure

例句：

1. 1.The farmers used the pond sludgeto fertilize their crops.
   农民们用池塘污泥来施肥他们的庄稼。
2. 2. The pondsludge was a valuable resource forthe local fisheries.
   池塘污泥是当地渔业的宝贵资源。
3. 3. The pond sludgewas contaminated with heavy metals, which could harm aquatic life.
   池塘污泥被重金属污染，这可能会危害水生生物。