以下为句子列表：
英文: Both of these facts mean it is likely that some lineages which seem to make their first appearance in the extratropical fossil record actually started out near the equator.
中文: 上述两种因素都表明某些世系虽最早出现在热带外区域的化石记录上，实际上却有可能起源于赤道附近。
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英文: But the scrappy fossil record of early primates—mostly teeth and isolated skeletal bones—left researchers hard put to test these hypotheses.
中文: 但是，早期灵长类的化石记录（以牙齿和零散的骨骼居多）实在太少了，让研究人员难以验证这些假说。
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英文: Fossil experts had long been inclined to agree with the volcanism theory because the disappearance of species in the fossil record appeared to be gradual.
中文: 化石专家过去一向支持火山说，因为从化石记录来看，物种似乎是逐渐灭绝的。
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英文: If we could document the spontaneous generation of just one complex life-form from inanimate matter, then at least a few creatures seen in the fossil record might have originated this way.
中文: 要是复杂生物可以从没有生命的物质自然发生，我们只要提出证据，哪怕只是一件，那麽我们就可以推论，化石记录上至少有一些生物也许就是以同样的方式形成的。
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英文: In 1982 they recognized that the typical approach for defining the last occurrence of a given species did not take into account the incompleteness of the fossil record or the biases introduced in the way the fossils were collected.
中文: 他们在1982年指出，过去用来定义某个物种「在生命史上最后一次出现」的方法，没有考虑到「化石记录不完整」，或者「化石收集不是个随机过程」等事实。
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