Extinct but already fully marine cetaceans are known from the fossil record.
从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。
But what does the fossil record show?
但化石记录显示什么呢？
Dr Knoll drew this conclusion by studying the fossil record.
努尔博士通过研究化石记录得出了这个结论。
There is a much better fossil record for mammals than for many other groups.
哺乳动物的化石纪录比别的类别的好的多。
To make the most spectacular living fossil record the world has ever seen.
要把他们所见到的壮观的活化石都统统记录下来。
However, the fossil record retains evidence of many of these older species.
尽管如此，化石上的记录保留了很多古老物种存在过的证据。
However, the fossil record retains evidence of many of these older species.
尽管如此，化石上的记录保留了很多古老物种存在过的证据。
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