死去的生物中也只有一小部分被这样保存下来。
Only a small fraction of the creatures that die are preserved in this way.
如果生物体死于一个快速沉积和缺氧的环境，那么软组织残骸实际保存下来的可能性会提高。
The probability that actual remains of soft tissue will be preserved is improved if the organism dies in an environment of rapid deposition and oxygen deprivation.
由于许多古生物学家的工作仅基于化石的形状，因此其保存方法并非旨在保存 DNA。
Because many palaeontologists base their work on the shape of fossils alone, their methods of conservation are not designed to preserve DNA.
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