Early experiments with military rockets prepared the ground for space travel.
早期军用火
的试验为太空飞行奠定了基
。
Early experiments with military rockets prepared the ground for space travel.
早期军用火的试验为太空飞行奠定了基。
The Americans and Russians have launched many rockets into space.
人和俄罗斯人已把许多火发射到太空。
The rocket boosts the astronaut into space.
这火能把宇航员送入太空。
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