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Large numbers of dinosaur fossils have been discovered in deposits on Alaska’s North Slope, a region that today experiences an extremely cold, arctic climate. One hundred million years ago, when those dinosaurs were alive, the environment of the North Slope was already inhospitable, especially during the winter when it experienced several months of total darkness. How did the dinosaurs survive the wintertime? Paleontologists have proposed that one of the most common North Slope dinosaurs, the elephant-sized Edmontosaur (Edmontosaurus), survived the winter by migrating south to more hospitable regions. Several arguments support the migration hypothesis.
现今经历极寒，拥有北极气候的阿拉斯加北坡，发掘出了大量恐龙化石。一亿年以前，当这些恐龙依然存活的时候，北坡环境就已然不宜生物居住了，尤其在冬季，北坡经历着长达数月的黑暗。当时的恐龙是如何在那里的冬季生存下来的?以当时最常见的北坡恐龙——一种大象般大小的埃德蒙顿龙为例，古生物学家做出了如此假设：埃德蒙顿龙依靠迁徙至南部更宜居的区域来度过北坡的冬季。对于以上假说，有如下几点论据。
First, the Edmontosaur diet supports the migration hypothesis. Edmontosaurus fed exclusively on plants. Since there would have been no plants growing during the cold and dark North Slope winter, it appears that the Edmontosaur must have left for at least part of the year and migrated to more temperate zones to find food.
首先，埃德蒙顿龙的食谱支持了迁徙说。埃德蒙顿龙仅以植物为食。由于在寒冷而黑暗的冬天，北坡并无植物生长，埃德蒙顿龙势必在一年中的部分时间离开北坡，迁徙至更温暖的区域觅食。
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