rubble-mound for foot protection

例句：

1. 1.The construction site was littered with rubble-mounds of broken concrete.
   施工现场到处都是破碎的混凝土形成的废墟堆。
2. 2. The rescue workers carefully cleared the rubble-mounds to search for survivors.
   救援人员小心翼翼地清除废墟堆以寻找幸存者。
3. 3.The city was rebuilt from the rubble-mounds left by the earthquake.
   这座城市从地震后留下的废墟堆中重建起来。