sika

例句：

1. 1. The ancient city is built on a large stone foundation.
   这个古老的城市建立在一块大石头的基础上。
2. 2. The stone wall was made of the finest marble.
   这座石墙是用最优质的大理石制成的。
3. 3. He carefully picked up the small stone and placed it in his pocket.
   他小心翼翼地捡起了那块小石头，放进了他的口袋。