Needs change while policies fossilize.
政策僵化，需求就产生变化。
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。
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.
关于在这一亿年的重要时期中没有化石，有一种解释是，早期的动物是软体动物，根本不会变成化石。
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。
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。
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。
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