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。

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Then has studied the northwest electric theory of price of marketing of region.

接着研究了西北区域电力市场交易价格理论。

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At the moment, this route through the Canadian archipelago is navigable at best for a brief summer spell. (Sovereignty over the passage is one of the Arctic's many unresolved issues: Canada claims it, but the United States says the waters are international.) In theory, a complete opening of the Northwest Passage can shave 2, 500 miles off a journey from Europe to Asia.

ECONOMIST: The Arctic