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天然 てんねん放射 ほうしゃ性 せい同位 どうい体 たいじゃない
tennenhōshaseidō itaijanai

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Noun
, 
Da Copula
, 
Negation Auxiliary

The negative form of 天然放射性同位体

1. Not a naturally occurring radioisotope.

Negative

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天然放射性同位体じゃない

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