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。
In this scenario, hydrogen would no longer be stable, but its slightly heavier isotopes deuterium or tritium could be.
它使用两种类型，或称同位素，的氢——氘和氚。
Two types, or isotopes, of hydrogen are used - deuterium and tritium.
氚是氢的放射性形式，有时被称作超重氢。
It is a naturally occurring radioactive form of hydrogen, sometimes known as heavy hydrogen.
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