Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.
在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。
Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.
当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。
In this scenario, hydrogen would no longer be stable, but its slightly heavier isotopes deuterium or tritium could be.
在这个设定中，氢不再是稳定的，但是其更重些的同位素氘和氚却是稳定的。
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