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Dr Field’s team set about the task by analysing ancient records of birch pollen preserved in lake sediments from known mammoth breeding grounds like Siberia. 菲爾德博士的研究團隊已經開始這項工作，在諸如西伯利亞等己知猛獁象的繁殖地點，他們對湖區沉澱物中保存的樺樹花粉的遠古信息進行了分析。