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力地球引力场等因素的摄动,其形状近地点位置将不断改变。

Distribution and transfusion of the geostatic pressure variate in company with mining space in underground mining.

地下开采中地与转移随开采空间变动而变动,不同的开采顺序会带来不同的围岩稳定性。