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加拿大拓荒者博物院研究人员托马斯·约翰逊教授在今年8月北京举行的国际海岸带学术讨论会上说,美洲大陆的人类祖先有可能是12万年前从亚洲大
Professor Thomas Johnson, a researcher at Canada’s Pioneer Museum, told the International Symposium on Coastal Shores in Beijing in August this year that the human ancestors of the continent may be 120,000 years ago from Asia