化石

例句：

1. 1. Fossils are fascinating because they tell us about the past.
   化石令人着迷，因为它们告诉我们过去的事情。
2. 2. The discovery of a new species of ammonite has sparked excitement in paleontologists.
   新发现的鹦鹉螺物种引起了古生物学家们的兴奋。
3. 3. Fossils have been used to study the evolution of life on Earth for thousands of years.
   化石被用来研究地球上生命演化了数千年。