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）。
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.
氢是最轻的元素，原子核中只有一个质子，而铀这种自然形成的最重元素的原子核中有92个质子。
Hydrogen, the lightest element, has a single proton whereas uranium, the heaviest naturally occurring one, has 92.
氢的一种同位素，在其原子核内有一个质子和一个中子，其原子重量为2.04。
An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.04.
氘氢的一种同位素，在其原子核内有一个质子和一个中子，其原子重量为2。
An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of2.014.
氘氢的一种同位素，在其原子核内有一个质子和一个中子，其原子重量为2。
An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of2.014.
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