重水因含重氢而得名。重氢是氢原子的一种，其原子核中含有一枚中子，加之正常氢元素中的质子，重量为一般氢原子的两倍。
Heavy water gets its name because it contains deuterium, a form of hydrogen that has a neutron in its nucleus as well as the usual proton and thus weighs twice as much as the ordinary sort.
研究人员利用所谓的离子显微镜来比较月球岩石中正常的氢元素含量及同位素氘的含量，元素氘比氢多带一个中子。
The researchers used what's called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.
欧洲货币单位后的表现是正常的复位和100公里左右后，欧洲货币单位开始追上新的阅读由于电子气体氢输出并给出更好的赛车性能的。
The performance after ECU reset is normal and after around 100km, the ECU starts to catch up the new reading due to E-Gas hydrogen output and gives better performance for the car.
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