saw-tooth thin shell

例句：

1. 1. The saw-tooth thin shell is a type of fossil that can be found in rocks.
   锯齿状薄壳是一种可以在岩石中找到的化石。
2. 2. The saw-tooth thin shell is often used as a decorative item in jewelry making.
   锯齿状薄壳常被用作珠宝制作中的装饰品。
3. 3. The saw-tooth thin shell has been found in many different parts of the world, including Africa and Asia.
   锯齿状薄壳在世界许多地方都有发现，包括非洲和亚洲。