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1·It is a naturally occurring radioactive form of hydrogen, sometimes known as heavy hydrogen.

氚是氢的放射性形式，有时被称作超重氢。

2·It is a naturally occurring radioactive form of hydrogen, sometimes known as heavy hydrogen.

它是氢气的一种形态，它自然发生放射，有时被人们称为重氢。

3·Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin.

研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。

4·Fusing heavy hydrogen isotopes requires lots of energy, partly because the nuclei are positively charged and repel each other.

融合重氢同位素需要大量能量，部分原因是因为原子核带正电并相互排斥。

5·Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin. Christopher Intagliata reports The Apollo moon missions ended almost 40 years ago.

研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。

6·Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).

重水之所以重是因为水中氢的重量是普通氢的两倍（它的原子核中有一个质子和一个中子，而不仅仅是一个质子）。

7·Hydrogen is lighter than air, but compressing it, storing it in tanks and adding all the necessary equipment starts to tip the scales towards heavy again.

氢气比空气轻，但是将它经压缩存储在燃料箱中并添加所有必需设备后飞机又变重了。

8·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.

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。

9·This is the DEUT ERIUM PLANT, an automated facility for extracting the heavy isotope of hydrogen from the local water supply.

实际上这是个加工厂一个全自动化的设施通过来从当地水源中提取氢气的重同位素来生产氘气。

10·Among this group, most of those with traces of heavy elements also have traces of hydrogen.

这类白矮星中有着重元素痕迹者，大多也会有氢的痕迹。