For the crew of a spacecraft ramping up to light speed, interstellar space would appear highly compressed, thereby increasing the number of hydrogen atoms hitting the craft.

对宇宙飞船的船员来说，速度升高到光速，宇宙空间将被高度压缩，因此增加了撞击飞船的氢原子数量。

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Fuel cells can use various sources of hydrogen, including a simple tank of compressed gas.

燃料电池能使用各种来源的氢气，包括一种简单的压缩气储罐。

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Regardless of the method of production, the product steam is then separated into its components and the hydrogen dried, purified, and compressed into cylinders or tubes for transportation.

不管用什么生产方法，接着产品蒸气都要被分成它的组成成分，随后把氢干燥、净化、压缩进钢瓶或管道，以便运输。

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And in Detroit, BMW will showcase its 750hL, a large, 7-Series sedan with a nearly conventional V-12 motor powered by compressed hydrogen.

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This is drawn into the engine, compressed and mixed explosively with a small amount of hydrogen.

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But because it is a gas, hydrogen can only be transported and stored safely if it is liquefied or compressed, which takes a lot of energy.

BBC: Hydrogen's energy promise improves