极地平流层云或珠母云由冰晶形成，位于大气层的中间层，是地球大气中位置最高的云层，达到约76至85千米。
Polar mesospheric or Notilucent clouds are made of crystals of water ice and are the highest clouds in the Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres
极地平流层云或珠母云由冰晶形成，位于大气层的中间层，是地球大气中位置最高的云层，达到约76至85千米。
Polar mesospheric or Notilucent clouds are made of crystals of water ice and are the highest clouds in the Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres
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