氘是普氢较重的、稳定同位素。
Deuterium is a heavier and stable isotope of ordinary hydrogen.
Reaction Engines Ltd的未来计划总监马克·汉普塞尔向CNN透露，天龙的引擎在开始时将氢与空气混合燃烧，然后会像航天飞机一样，将氢与液氧混合燃烧。
Mark Hempsell, future programs director at Reaction Engines Ltd, told CNN: 'The engine starts by burning hydrogen with air and finishes up burning hydrogen with liquid oxygen like a shuttle engine.'
泽·普赖姆闷闷不乐地开始收集星际空间的氢，用来造一颗自己的小恒星。
Unhappily, Zee Prime began collecting interstellar hydrogen out of which to build a small star of his own.
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