There is growing support for the theory that migration took place much earlier, by sea, following a coastal route along Alaska and down the northwest coast.
越来越多的人支持这样一种理论，即移民发生得要早得多，是沿着阿拉斯加沿海路线，沿西北海岸而下通过海路进行的。
Scientists found that coastal erosion caused by retreating sea ice is damaging remains in an Inuit village in Alaska, including a fourth-century coastal cemetery.
科学家们还发现，受到侵蚀的海岸线已经威胁到了生活在阿拉斯加的因纽特人村庄，其中还有年久的沿海墓地遗迹。
They are formed by glaciers—large rivers of ice that begin inland in the snows of Greenland, Antarctica, and Alaska—and move slowly toward the sea.
冰山是由冰川----从格陵兰岛，南极洲，和阿拉斯加的内陆降雪开始积累成为大河中的冰----然后缓慢流入海洋。
In some parts of the Beaufort sea, north of Alaska and western Canada, ice that measured 3.3 m thick at the beginning of the summer measured just 50 centimeters by season's end.
在波弗特海的部分海域，阿拉斯加的北部和加拿大的西部，夏天开始时冰的厚度为3.3米，但到了季末仅仅为50厘米。
In some parts of the Beaufort sea, north of Alaska and western Canada, ice that measured 3.3 m thick at the beginning of the summer measured just 50 centimeters by season's end.
在波弗特海的部分海域，阿拉斯加的北部和加拿大的西部，夏天开始时冰的厚度为3.3米，但到了季末仅仅为50厘米。
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