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现在的航天飞机必须靠助推火箭的推力才能发射成功,而根据“X-33”方案设计的航天飞机,可自带引擎和燃料,垂直发射升空,进入预定的地球轨道。
The current space shuttle must rely on the thrust of the rocket to launch successfully. The space shuttle designed on the “X-33” scheme can launch its engines and fuel vertically and launch vertically into the intended orbit.