届时地面控制人员将点燃助推器，把卫星送入预定轨道。
Ground controllers will then fire the booster, sending the satellite into its proper orbit.
但在发射点，轨道器一面是15层楼高的外挂燃料箱，两侧是两个固体火箭助推器。
But in launch position, the orbiter is perched on the side of its 15-story external fuel tank and flanked by two solid rocket boosters.
在与火箭分离之后，货运飞船将利用自身的助推器进入轨道位置。
After separating from the Ariane, the freighter will use its own thrusters to get to the orbiting outpost.
但是追溯、反向分析它过去的轨道位置表明这个小家伙在人类太空时代不可能近距离靠近地球，也就不可能是火箭助推器了。
But running the object's orbit backwards showed that the asteroid never came close enough to Earth during the space age to have started life as a rocket booster.
他们发现，使用液体助推器可大大提高航天飞机的安全性，并使其低地轨道和空间站轨道有效载荷能力分别提高36%和50%。
What they have found is that the Shuttle using a liquid booster could be much safer and could carry 36% more payload to low Eeath orbit and 50% to space station orbit.
他们发现，使用液体助推器可大大提高航天飞机的安全性，并使其低地轨道和空间站轨道有效载荷能力分别提高36%和50%。
What they have found is that the Shuttle using a liquid booster could be much safer and could carry 36% more payload to low Eeath orbit and 50% to space station orbit.
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