柯林斯詞典isotope /?a?s??t??p/ (isotopes) 1. N-COUNT Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties. 同位素[技術(shù)] ...tritium, a radioactive isotope of hydrogen. ...氚，氫的一種放射性同位素。 返回 isotope劍橋詞典a form of an atom that has a different atomic weight from other forms of the same atom but the same chemical structure 同位素 a radioactive isotope of hydrogen 氫的放射性同位素 返回 isotope