例如，他提到一篇科学论文中言及苔藓，细菌和其他类似的生物可能是史前地质情况和陆地形成的推动力。
For example, he mentions a scientific paper that suggests that lichens, bacteria and the like may have been a driving force behind prehistoric geology and the formation of continents.
它们是地外文明来访、时间旅行者或者遗失文明如阿特兰蒂斯的证据——又或许是某些比我们想象还要先进的史前人类展示给我们的东西。
They're evidence of extraterrestrial visitation, time travelers or lost civilizations like Atlantis - or perhaps they're here to show us that some ancient peoples were far more advanced than we think.
在史前时期，我从欧亚大陆穿越白令海峡、走过陆地、桥第一次来到了北美。
I first came to North American in prehistoric times when I crossed the Bering Strait land bridge from Eurasia.
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