但是由于这个非常低标准的氚，进入到地下水里，迁移了水，关闭了实验室。

But because of this very low level tritium getting into the ground water and migrating it shut the laboratory down.

youdao

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.

youdao

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.

youdao