1. Polar distance; polar diameter. 
   极距；两极的直径
2. geography of polar region 
   极地地理
3. International Polar Motion Service 
   国际极移服务
4. coronal streamer and polar plume 
   冕流和极羽
5. non-polar variation of latitude 
   非极纬度变化

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• 1. 互极图形
  对比帐户 mutually polar figures...互极图形 mutually protected occlusion...[医]相互保护牙合 mutually responsible
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• 2. 对比帐户
  {n.}对销帐户 mutually offsetting accounts...对比帐户 mutually polar figures...互极图形 mutually protected occlusion
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