solid-fuel booster 예문

예문

1. 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
2. So far this reality has limited spaceflight to multistage expendable rockets or the space shuttle , which is assisted by strap - on fuel tanks and solid - fuel boosters that are jettisoned during ascent