空晶石

例句：

1. 1. The hollow crystal stone is a popular ornament in Chinese culture.
   空心水晶石是中国文化中流行的装饰品。
2. 2. The ancient city of Kunming is known for its beautiful hollow crystal stones.
   昆明古城以其美丽的空心水晶石而闻名。
3. 3. The hollow crystal stone was used as a symbol of good luck in ancient times.
   空心水晶石在古代被用作好运的象征。