单词	radiotracer
释义	radiotracer noun ra·​dio·​trac·​er ˈrā-dē-ō-ˌtrā-sər  : a radioactive tracer Example Sentences Recent Examples on the Web These radiotracers decay via positron emission, creating back-to-back gamma rays that are simultaneously detected by a PET scanner. Julie Grisham, Scientific American, 9 July 2019 Word History First Known Use 1946, in the meaning defined above Medical Definition radiotracer noun ra·​dio·​trac·​er ˈrād-ē-ō-ˌtrā-sər  : a radioactive tracer
随便看	fidley fido fidos fids fiducia fiduciae fiducial fiducially fiduciaries fiduciarily fiduciary fiduciary bond fiduciary coemption fiduciary contract fiduciary heir fiduciary relation fidus Achates fie Fiedler fiedlerite fief fiefdom fiefdoms fiefs field

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