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詞 isotope:
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one of two or more atoms with the same atomic number but with different numbers of neutrons
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用作名詞 (n.)
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Later he named these separate forms isotopes.
最后他稱這樣有差異 的手段為放射性核素。
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Tritium is one of the mildest radioactive isotopes.
氚是普及最和緩的射線性放射性核素一種。
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海詞辭典,二十七年品牌形象