Years of topography and climate change have fossilized the rotten plants.

长年累月的地形和气候变化使腐烂的植物变成了化石。

Animal carcasses have gradually fossilized in the long evolution of the earth.

动物尸体在长久的地球演化中逐渐变成了化石。

These plants and animals have been fossilized underground.

这些植物和动物在地下已成化石。

In millions of years, skeletons will fossilize. 

几百万年后 骨骼会变成化石

Needs change while policies fossilize.

政策僵化，需求就产生变化。

The tissue and cartilage of a nose are too soft to fossilize.

鼻部的组织和软骨结构太软，无法形成化石。

They seem to want to fossilize the environment in which people live and work.

他们看样子想把人们工作和生活环境陈腐化。

The most important parts, the flowers, rarely fossilize.

最重要的部分，即花朵，很少成为化石。

Animals this small do not fossilize well, which is why this stage of the distant evolutionary past is so little known.

这么小的动物很难形成良好的化石，这就是为什么过去我们对这一阶段的进化过程知之甚少的原因。