西北航线
- 网络Northwest Passage;PNW
西北航线-
北极航线可以分为东北航线、西北航线和北极点航线。
The Arctic Passage can be divided into the Northeast Passage , the Northwest Passage and the North Pole Passage according diffident route .
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北极航线主要有三条航线：分别是东北航线、西北航线和北极点航线。
Arctic Route includes three routes , its Northeast Route , the Northwest Route and the North Pole Route .