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The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.
人造地球卫星的轨道由于大气阻力和地球引力场等因素的摄动，其形状和近地点位置将不断改变。
词根 atmosphere
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atmospheric adj. 大气的，大气层的
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atmosphere n. 气氛；大气；空气
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atmospherics n. 大气干扰；天电