Can you tell me why a rocket can fly in outer space?
你能告诉我为什么火箭能够飞入外层空间吗？
I suppose it was very dangerous to fly a rocket, wasn't it?
我想驾驶火箭是很危险的，是吗？
The rocket can fly at constant speed and constant altitude.
火箭控制系统可保证其在某一高度上平飞。
I'll fly to the moon by rocket some day.
总有一天我会乘坐火箭到月球上去。
Should I make a rocket? Should I try to fly away?
我是否该做一个火箭，然后乘之离开？
Should I make a rocket? Should I try to fly away?
我是否该做一个火箭，然后乘之离开？
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