A section of a ROCKET vehicle that is cast off and separates from the vehicle during flight, especially a section that falls back to EARTH.

在飞行过程中从火箭运载工具上与其脱开和分离的部分，特别是掉回地球的一部分。

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Combining a rocket, a jet and a racing-car engine into one vehicle is engineering of an extreme sort, but record-breaking often demands that new problems be solved.

将火箭发动机、喷气式发动机和赛车发动机整合到一部车里，是一种极不寻常的设计，但是破纪录经常需要解决很多新问题。

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Hydrogen is "just about the worst possible vehicle fuel", says Robert Zubrin, a rocket scientist and the author of "Energy Victory", a book on the post-petroleum future.

氢“只是最坏情况下的汽车燃料选择，”火箭科学家罗伯特·祖布林说，他还是《能源的胜利》的作者，这是一本讲述关于后石油未来的书。

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The rocket vehicle is known as SpaceShipTwo (SS2).

BBC: Science correspondent, BBC News

But it is notoriously ill-suited to high-tech industries that have to tailor each item to a customer's specific needs (as in a data-switching centre or air-traffic-control system) or in which it is crucial that thousands of interrelated components all work correctly together (as in a rocket vehicle).

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"I was in a vehicle and a rocket came through the window, " he said.

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