这样以来，径向式发动机占据的空间很小。

Such a radial engine occupies little floor space.

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电火箭发动机是一种新型的空间推进装置。

Electrical rocket engine is a new type of space propulsion system.

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而且，发动机变得相当长，占据了相当多的空间。

Also, the engine becomes quite long and takes up considerable space.

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而且，发动机变得相当长，占据了相当多的空间。

Also, the engine becomes quite long and takes up considerable space.

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