slag heap

例句：

1. 1. The factory produces a lot of slag heaps for the construction industry.
   这家工厂为建筑业生产了大量的废渣堆。
2. 2. The slag heap is a hazardous waste that needs to be properly disposed of.
   废渣堆是一种危险废物，需要妥善处理。
3. 3. The workers were working in the slag heap when they suddenly felt a sharp pain in their backs.
   工人们在废渣堆工作时突然感到背部剧痛。