石质的

例句：

1. 1. The stone wall is very sturdy and can withstand heavy rain.
   这堵石墙非常坚固，可以承受大雨。
2. 2. The rocks in the riverbed are very hard and difficult to move.
   河床上的石头非常硬，很难移动。
3. 3. The old castle was built of stone and has stood for centuries.
   这座古老的城堡是用石头建造的，已经屹立了几个世纪了。