石化

例句：

1. 1. The process of petrification has been studied for centuries.
   石化过程已经研究了几个世纪了。
2. 2. Thefossils found in thecave are evidence of ancient life.
   洞穴中发现的化石是古代生命的证明。
3. 3. The petrified tree is arare example of prehistoric life.
   石化的树是史前生命的一种罕见例子。