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isotope
sətoʊp ˈaɪsəˌtəʊp ˈaɪsəˌtoʊp
Word forms: plural isotopes
N-COUNT 同位素 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 [technical]
  • ...tritium, a radioactive isotope of hydrogen.

    氢的放射性同位素氚

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