然而远古哺乳动物化石仍然十分罕见，主要是因为其体型太小。
But ancient-mammal fossils are still exceedingly rare, mostly because of their small sizes.
2004年，研究人员们在北极高地现场搜寻哺乳动物化石。
Researchers in the field search for mammal fossils in the High Arctic in 2004.
该地点属洞穴堆积，采集哺乳动物化石12种，石制品二千余件。
The site belongs to cave accumulation, in which there are 12 mammalian fossil species and more than 2000 pieces of paleoliths.
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