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.
同恒星相类似，棕矮星能够融化氢原子，但它们重量太轻，它们还不能把融化氢的过程持续下去。
Like stars, brown dwarfs are capable of fusing a rare form of hydrogen called deuterium, but they are too lightweight to burn ordinary hydrogen and quickly run out of fuel.
一个氦原子的重量不到四个原始氢原子。
A helium atom weighs less than the four original hydrogen atoms.
氢原子较之其他任何元素的原子的重量都轻，结构都简单。
The hydrogen atom is lighter and simpler than the atoms of any other elements.
氢原子较之其他任何元素的原子的重量都轻，结构都简单。
The hydrogen atom is lighter and simpler than the atoms of any other elements.
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