The $3.5bn National Ignition Facility (NIF) sits in a 10-storey building covering three football fields and will harness the power of lasers to turn tiny pellets of hydrogen into thermonuclear energy.

美国国家点火装置（简称NIF）耗资35亿美元，建在一个十层楼高的建筑里，占地面积有三个足球场那么大。 它将利用激光把氢同位素靶丸转化为热核能量。

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Though the fuels are frosty, upon ignition they generate scorching steam (5, 000 degrees) and plenty of thrust: Hydrogen is 40 percent more efficient than other propellants.

虽然极寒，而在点火后此燃料可以产生炽热的蒸汽(5000度)和足够的推力：氢比其它推进器燃料的效率高出40%。

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Hydrogen injection and scramjet ignition testing.

氢注入及冲压点火测试。

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Engineers discovered the problem during fueling, and worried that any excess hydrogen on the launch pad could cause an explosion during engine ignition.

VOA: standard.2009.03.15