The tides are caused by the attraction of the moon for the earth.
潮汐是月亮对地球起。
The tides are caused by the attraction of the moon for the earth.
潮汐是月亮对地球起。
The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.
人造地球卫星轨道于大气阻和地球场等因素摄动,其形状和近地点位置将不断改变。
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