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天然放射性本底 tiānrán fàngshèxìng běndǐ
met. natural radiation background
sport., med. natural radioactive background
tech. natural radioactivity background
天然放射性本底【核】 tiānrán fàngshèxìng běndǐ
el. natural radioactivity background
天然 放 射性本底
: 3 phrases in 3 subjects
Chemistry1
Nuclear physics1
Technology1

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