Lasers also need chemical fuel or electrical power which is not readily available in space.
激光需要的化学燃料或者电力还没办法轻易安置在太空。
Large amounts of special fuel are needed to launch a rocket into space.
发射火箭进入太空需要大量的特殊燃料。
NASA space shuttles each have three fuel control valves one for each main engine.
美国宇航局航天飞机每一个有3个燃料控制阀，为每个主引擎之一。
NASA space shuttles each have three fuel control valves one for each main engine.
美国宇航局航天飞机每一个有3个燃料控制阀，为每个主引擎之一。
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