"Until we commit to going back to Mars, we're not going to have a nuclear rocket," McDaniel said.
“我们在决定去火星之前，都不会拥有一枚核能火箭。”麦克·丹尼说到。
So far NASA is exploring two options for propulsion there? A nuclear thermal rocket and a chemical engine.
迄今为止NASA研究了两种前往那里的备选推进器：核热火箭和化学发动机。
They might, by attaching rocket motors to the incoming rock, or nudging its orbit with nuclear explosions, even be able to avert disaster.
通过在接近的小行星上安装火箭助推，或者通过核爆炸略微改变其的轨道，就有可能避免一场灾难。
Beyond the nuclear rocket designs, the United States also launched a small nuclear reactor, SNAP10a, into space that generated electricity.
除了核能火箭设计之外，美国也向太空发射了一个小型核反应堆SNAP10a，并产生了电能。
Such a technique could take around 16 months but could be cut to four months if a nuclear rocket was used.
这种技术将需要16个月左右，如果利用核火箭的话可以缩短四个月。
The rocket uses a nuclear engine, a technology that was under serious investigation for a long time (and may yet see its day in space).
宇航员的火箭使用的是核动力引擎，该技术长久以来都处在认真研究之中（但至今仍未能投入实用）。
The rocket USES a nuclear engine, a technology that was under serious investigation for a long time.
火箭采用的则是人们长期以来一直认真研究的核动力引擎技术。
A nuclear rocket such as this would be inherently safe and environmentally harmless: contrary to popular belief, a nuclear rocket need not be strongly radioactive when launched.
这种核能燃料火箭有其固有的安全性，而且对环境没有危害。与普通的看法相反，核燃料火箭在发射时未必有很强的核辐射。
Aerospace, gas turbines, rocket motors, spacecraft, space shuttles, nuclear reactors, turbo pump seals and cryogenic storage tank.
应用领域涉及宇航，燃气涡轮，火箭发动机，太空船，航天飞机，核反应堆，涡轮泵密封件和低温贮藏容器。
The technology required to build a rocket motor powered by nuclear fuel is not far beyond current capabilities.
建造以核燃料为动力的火箭发动机所需要的技术离目前的技术能力并不太远。
The spacecraft, with its nuclear rockets, would be launched on top of a conventional chemical rocket.
带有核燃料火箭的宇宙飞船可在普通化学燃料火箭上发射。
Then, once the vehicle had ascended to high-Earth orbit, above about 800 kilometers, the nuclear reactor module would detach from the chemical rocket and start up.
这样，当普通燃料火箭到达地球轨道约800公里高度时，核反应堆舱会脱离化学燃料火箭，并开始工作。
Then, once the vehicle had ascended to high-Earth orbit, above about 800 kilometers, the nuclear reactor module would detach from the chemical rocket and start up.
这样，当普通燃料火箭到达地球轨道约800公里高度时，核反应堆舱会脱离化学燃料火箭，并开始工作。
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