1. "So to maintain the topography of the south polar cap, there has to be water ice in there stiffening it up." 
   所以要想维持南部冰冠的地形，就必须有冰水使其变得坚固。”
2. Polar distance; polar diameter. 
   极距；两极的直径
3. geography of polar region 
   极地地理
4. International Polar Motion Service 
   国际极移服务
5. coronal streamer and polar plume 
   冕流和极羽

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• 1. 南极的
  south 南部...south-polar 南极的...south-southeast 南东南
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