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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. 菲尔德博士的研究团队已经开始这项工作，在诸如西伯利亚等己知猛犸象的繁殖地点，他们对湖区沉淀物中保存的桦树花粉的远古信息进行了分析。