还有另外两种研究对印第安人的起源提供了一些线索；它们包括对牙齿和语言的研究。
There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages.
加拿大感恩节的来历还存在争议，不过美国感恩节起源于1621年美国普利茅斯殖民者与当地万帕诺亚格印第安人共同享受了为期三天的收获节大餐。
Canada's Thanksgiving origins are contested, but the US traces the holiday back to 1621, when America's Plymouth colonies shared a three-day autumn harvest feast with the Wampanoag Indians.
多年来，山顶洞人作为东亚地区更新世晚期人类的代表，在研究东亚地区现代蒙古人种及美洲印第安人起源方面发挥着重要作用。
For decades, as the representative of the late Pleistocene human in east Asia, the Upper Cave skulls have played an important role in research on the origins of modern Mongoloids and American Indians.
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