And, of course, it does not have to carry tons of rocket fuel.

而且，它显然无需携带成吨的火箭燃料。

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A rocket engine typically goes faster but has to carry its own supply of oxygen.

火箭发动机通常使飞行更快，但需要自携氧气。

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A rocket engine typically goes faster but has to carry its own supply of oxygen.

火箭发动机通常使飞行更快，但需要自携氧气。

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