milky opal

例句：

1. 1.The milky opal gemstone is a rare and valuable mineral.
   牛奶蛋白石宝石是一种稀有且有价值的矿物。
2. 2. The milky opal gemstone has been used in jewelry for centuries.
   牛奶蛋白石宝石在珠宝中被使用了几个世纪。
3. 3. The milky opal gemstone is known for its unique color and texture.
   牛奶蛋白石宝石以其独特的颜色和质地而闻名。