artificial satellite [航] 人造卫星 ; 人工卫星 ; 天然卫星 ; 人造卫
launch an artificial satellite 发射人造卫星
theory of artificial satellite motion 人造地球卫星运动理论
launch h an artificial satellite 发射人造卫星
artificial earth satellite [航] 人造地球卫星 ; 人造卫星 ; 地球人造卫星 ; 简称人造卫星
artificial satellite geodesy [测] 人造卫星大地测量学
artificial satellite dynamics [航] 人造地球卫星动力学
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。
Sputnik - the first artificial satellite - is launched by the Soviet Union on October 4, 1957, as a global positioning system for precise weapon delivery and paves the way for GPS as we know it today.
1957年10月4日，苏联发射了首颗人造卫星“斯普特尼克”作为精准武器的全球定位系统，为我们今天所知的GPS铺平了道路。
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？
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