The term "fossil" often implies petrifaction, literally a transformation into stone.
“化石”这个词通常意味着石化，字面意思是变成石头。
2
Petrifaction may also involve a simultaneous exchange of the original substance of a dead plant or animal with mineral matter of a different composition.
石化还可能同时涉及将死亡的动植物的原有物质与不同成分的矿物质进行交换的作用。
3
This petrifaction may be existed over two million years.