water opal

例句：

1. 1. The water opal in the lake is a beautiful sight to behold.
   湖中的水琥珀是一道美丽的景观。
2. 2.The ancient city of Pompeii was buried under layers of water opal.
   庞贝古城被水琥珀层覆盖着。
3. 3.The water opal has been used for centuries as a gemstone and ornament.
   水琥珀作为一种宝石和装饰品已有数百年的历史。