The shuttle, in contrast, requires three rocket engines built into the vehicle, an external tank of liquid hydrogen and oxygen to feed those engines, and a pair of solid-fuel boosters.

• 反观太空梭升空则需要使用三具内建的火箭引擎，外附装有液态氢和液态氧的燃料箱，以及一对固体燃料助力器。