By fossils, we mean traces of prehistoric animals such as bones, which become mineralized, or impressions of bones or organs that are left in stone.
我们所说的化石,指的是史前动物的遗迹,如已矿化的骨头,或留在石头上的骨头或器官的印痕。
The chances of escaping complete destruction are vastly improved if the organism happens to have a mineralized skeleton and dies in a place where it can be quickly buried by sediment.