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。
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.
你已经香得足以把他变成化石了。
脑部分本身是不会变成化石的，但在头盖骨内部却还保留着脑的轮廓。
The brain itself does not fossilise, but the inside of the cranium retains an impression of its contours.
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