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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
: 1 phrase in 1 subject
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