废石

例句：

1. 1. The old building has been turned into a park, with some old stones left as reminders of its past.
   这座旧建筑已经被改造成了公园，一些旧石头作为过去的回忆被保留下来。
2. 2. The construction crew had to dig up the old stone walls for new construction.
   施工队不得不挖掘出旧石墙来进行新的建设。
3. 3. The local government is considering repurposing these old stone monuments for cultural preservation.
   当地政府正在考虑将这些旧石碑重新用于文化遗产保护。