1. Unfortunately, behaviour does not
fossilise, so it looked as though the question might never be answered.
不幸的是，化石看不到动物的行为，因此这个问题似乎永远也得不到答案。
2. Protected workers, the bulk of the workforce, cling to their jobs. That tends to
fossilise the structure of the economy.
作为劳动力的主体的受保护工人能保有他们的工作，但这使经济结构僵化。
3. To avoid sampling bias, they restricted their analysis to one group of animals—the bivalve molluscs—that
fossilise well.
为了防止取样的偏颇，他们将分析的对象限制在一类化石记录保存完备动物——双壳类软体动物。
