... 燃料运转限度 fuel operating limit 燃料定位 fuel orientation 燃料丸 fuel pellet ...
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These wheels help the probe maintain its "attitude", or orientation, in space without needlessly expending fuel by using thrusters to do the same job.
BBC: NEWS | Science/Nature | Asteroid probe 'did touch down'
The orientation also makes for a much lower center of gravity than a typical fuel-cell car.
CNN: Hydrogen-bombing down the track
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