Rocket propellant has barely changed in the more than 50 years since the launch of the first artificial satellite Sputnik.
自第一颗人造卫星史泼尼克发射以来，火箭推进剂在超过50年的时间内变化不多。
The first artificial satellite.
第一颗人造卫星。
The life of an artificial satellite.
人造卫星的寿命。
Do you know when the first artificial satellite of America was launched?
你知道美国的第一颗人造卫星是什么时候发射的吗？
The orbit of the artificial satellite has an apogee of 200 miles from the earth.
这个人造卫星的轨道，其最远点在离地球200英里的地方。
The orbit of the artificial satellite has an apogee of 200 miles from the earth.
这个人造卫星的轨道， 其最远点在离地球200英里的地方。
Since 1957 the Soviet Union launched the first artificial satellite, the space age has begun.
自从1957年苏联发射了第一颗人造卫星，人类的空间时代就拉开了序幕。
Accurate measurement of the orbit parameters of the artificial satellite was provided by radio and optical stations.
人造卫星的精确轨道参数将由无线电和光学观测站测量得出。
The differential equations that describe the artificial satellite motion are very complicated, and it is impossible to get the analytic express of solution.
描述人造卫星运动的微分方程非常复杂，不可能给出解的解析表达式。
According to the practical instance of the apparatus modules of artificial satellite, the layout optimization models of the difform graph elements are discussed.
依照卫星仪器舱布局问题的实际应用状况，讨论多种图元的布局优化模型。
According to the practical instance of the apparatus modules of artificial satellite, the layout optimization models of the difform graph elements are discussed.
依照卫星仪器舱布局问题的实际应用状况，讨论多种图元的布局优化模型。
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