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天然放射性核素
tiānrán fàngshèxìng hésù
earth.sc.
natural radioactive nuclides
ecol.
natural radioactive nuclide
sport., med.
natural radionuclide
天然
存在的
放射性核素
geol.
naturally occuring radionuclides
天 然 放射性核素
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1 phrase
in 1 subject
Technology
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