Perched on the shoulders of the booster is the second stage, the most powerful hydrogen-fueled rocket ever built .
放在助飞火箭上的是第二节，那是迄今制造的最强大氢燃料火箭。
The world's first closed-loop engine, with thrust of about 7 tons and using liquid oxygen and carbon-hydrogen propellant, was installed in booster L.
世界上第一台可提供7吨推力的闭合回路液氧碳氢推进剂发动机被安装到L助推器上。
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