heavy isotope的用法和樣例：
例句
- More reactive are the heavier isotopes of hydrogen, deuterium and tritium.
更為活躍的是氫的較重同位素，氘和氚。 - 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餾為動力同位素分餾，導致重同位素在殘餘物中富集。
