knee stone

例句：

1. 1.The old man knelt down to the knee-stone and began to pray.
   老人跪下来对着膝盖石祈祷。
2. 2.The children gathered around the knee-stone and played games.
   孩子们围着膝盖石玩耍。
3. 3. The knee-stone is a popular tourist attraction in the area.
   膝盖石是该地区的一个受欢迎的旅游景点。