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| Arctic Ocean The smallest and most poorly studied of the oceans on earth. It covers an area of 14 million square km that is divided by three submarine ridges, i.e. the Alpha Ridge, the Lomonosov Ridge, and an extension of the mid-Atlantic ridge. It is also nearly landlocked, covered year-round by pack ice, and the third of its area is continental shelf (地球上最小且被研究最少的大洋。 它覆盖着一千四百万平方公里的区域，被三条水下脊分开，即阿尔法脊、罗蒙诺索夫脊、和一条延伸到到中大西洋的脊。 它几乎完全被陆地包围，终年为浮冰所覆盖，它的三分之一是大陆棚。) | |||
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| the Actic Ocean | |||
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北冰洋 : 14 phrases in 7 subjects |
| Desert science | 2 |
| Earth sciences | 4 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 4 |
| United Nations | 1 |
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