higher isotopes

• 较重同位素

higher isotopes的用法和样例：

例句

1. More reactive are the heavier isotopes of hydrogen, deuterium and tritium.
   更为活跃的是氢的较重同位素，氘和氚。
2. The isotopic fractionation under microbial actions belongs to the kinetic isotopic fractionation, which results in the enrichment of heavier isotopes in the remnants.
   微生物作用下的同位素分馏为动力同位素分馏，导致重同位素在残余物中富集。