当第一级烧毁后，沿抛物线的轨道落到地球，而第二级的发动机点火把火箭发射到地球轨道。
After the first stage burns out it falls back to earth along a parabolic path while the engines of the second stage fire to thrust the rocket into an earth orbit.
现在，牛顿理论认为，有一些彗星沿双曲线或抛物线运行，永远不再返回；另外一些彗星沿普通的椭圆轨道运行。
Now according to Newtonian theory, some of them moved in hyperbolas or parabolas never to return; others moved in ordinary ellipses.
侧位抛物线剖面是大位移井轨道设计中常用的剖面类型。
Lateral parabolic profile is common used in orbital design of the extended reach well.
侧位抛物线剖面是大位移井轨道设计中常用的剖面类型。
Lateral parabolic profile is common used in orbital design of the extended reach well.
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