platinum sponge

例句：

1. 1. The platinumsponge was used to filter the water fordrinking.
   铂海绵被用来过滤水供饮用。
2. 2. The platinum sponge is arare material that is highly valued in jewelrymaking.
   铂海绵是一种稀有材料，在珠宝制作中非常珍贵。
3. 3. Theplatinum sponge wasfound in the depths ofthe ocean, where it had beenformed over millions of years.
   铂海绵在海洋深处被发现，它已经形成数百万年了。