plumbosynadelphite

例句：

1. 1. The gemstone is a rare and valuable mineral.
   这块宝石是稀有且珍贵的矿物。
2. 2. The ancient city was buried under layers of sediment, making it difficult to excavate.
   这个古城被沉积物埋藏，挖掘起来非常困难。
3. 3. The platinum ring symbolizes eternal love and devotion.
   铂金戒指象征着永恒的爱和奉献。