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fossilize

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As well-studied as dinosaurs have been over the past couple of centuries, paleontologists have learned little about their breathing, because lungs do not fossilize.(尽管过去的几个世纪里，我们对恐龙类有比较深入的研究，可是古生物学家仍对它们的呼吸状态知之甚少，因为肺无法形成化石保存至今。)
One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft bodied and simply did not fossilize.(在这重要的一亿年的周期内缺乏化石（记录），关于这一点，有一种解释是早期的动物是软体动物，所以它们无法形成化石。)
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。)
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。)

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