/ˈtrɪt̬.i.əm/
an isotope (= a different form) of hydrogen with a mass that is three times that of the usual isotope 氚（氢的同位素）
/ˈtrɪt̬.i.əm/
an isotope (= a different form) of hydrogen with a mass that is three times that of the usual isotope 氚（氢的同位素）