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天然放射性本底 tiānrán fàngshèxìng běndǐstresses
gen. естественный фон радиоактивности
med. естественный радиационный фон
天然放射性本底【核】 tiānrán fàngshèxìng běndǐ
el. естественный фон радиоактивности
天然 放射性 本底
: 1 phrase in 1 subject
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