To avoid sampling bias, they restricted their analysis to one group of animals—the bivalve molluscs—that fossilise well.
为防止取样的偏颇,他们将分析的对象制在一化石记录保存完备动物——双软体动物。
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Also, why are these spreading cancers so common in shellfish?
此外,为什么这些扩瘤在中如此常见?
We've got little seashells and things like bivalves and brachypods.
我们有小的海贝、腕足等东西。
There were lots of ammonites and fossil and benamites and various brachiopods and various things from the Leicestershire Jurassic Upper Lyos.
那里有很多菊石、化石、生物以及来自莱斯特郡侏罗纪上层利奥斯地层的各种生物。
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