An analogy is to building a space rocket: you need a huge rocket engine, and you need a lot of fuel.

以造火箭来打个比方：你需要一台巨大的火箭引擎，你还要有足够的燃料。

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They got into a space rocket.

他们坐进了一个太空火箭。

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They got into a space rocket.

他们坐进了一个太空火箭。

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