decayed rock

例句：

1. 1. The old building had been decayed over time.
   这座老建筑因时间流逝而变得腐朽。
2. 2. The decayed rock was a hazard for hikers.
   腐烂的岩石对徒步旅行者来说是一大危险。
3. 3.The decayed rock was covered in moss and lichen.
   腐烂的岩石上长满了苔藓和地衣。