“云霄塔”系无人驾驶，它没有外部助推火箭，其发动机靠氢氧燃料提供推力。
The unpiloted Skylon has no external rockets, and its engines USES hydrogen and oxygen for propulsion.
“云霄塔”将可以从一个标准机场跑道起飞，然后以高于5倍音速的速度飞行。
Skylon will take off from a standard airport runway and travel at more than five times the speed of sound.
无顶的塔不断显现又隐匿，盲目的直插云霄。
Roofless towers appeared and disappeared, thrusting blindly upward.
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