ethmolith

例句：

1. 1.The ethmolith in the museum is a fascinating exhibit.
   博物馆里的石髓展品非常吸引人。
2. 2. The ancient city was buried under layers of ethmolith.
   这个古城被厚厚的石髓层所覆盖。
3. 3.The ethmolith has been used for centuries as a natural insulator.
   石髓作为一种天然绝缘材料，已经被使用了好几个世纪。