... polar meteorologist极地气象学家 polar orbiting satellite （POS）极地轨道卫星 polar ozone极地臭氧 ...
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极地轨道卫星经两极上空环绕地球运行，期间不断拍摄地球上不同的地区。
Polar-orbiting satellites revolve around the Earth along paths roughly passing over the poles. As they move, they obtain images of different parts of the Earth.
它们会定期返回到水面——这时数据将通过极地轨道卫星发送出去——并且不会受到表面冰层的困扰。
They return regularly to the surface (when the data is sent via polar-orbiting satellites) and are untroubled by surface ice.
本文研究如何用磁力矩器控制极地轨道上对地指向卫星的姿态。
This paper studies magnetic control of polar orbiting, nadir pointing satellite.
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