同位素 tóngwèisù isotope Definitions Defs Origin Strokes Stroke Words Sentences Sents 可裂变同位素 kělièbiàntóngwèisù fissionable isotope 同位素分离 tóngwèisùfēnlí isotope separation the process of separating different isotopes of the same chemical element放射性同位素 fàngshèxìngtóngwèisù radioactive isotope radioactive isotope; radioisotope