叫做碳化的另一种石化类型，发生在软组织以碳薄膜形式被保存下来的过程中。
Another type of fossilization, known as carbonization, occurs when soft tissues are preserved as thin films of carbon.
现在没有了针叶林，只有碳化的树木和空洞依然存在。
Now instead of coniferous forests there are just carbonized remains of trees and voids.
考虑到混凝土碳化的随机性，提出了混凝土碳化寿命的概率分析方法。
Considering the randomness of concrete carbonation, the paper put forward a probability analysis method of concrete carbonation span-life.
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