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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 たいじゃなかった
tennenhōshaseidō itaijanakatta

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Noun
, 
Da Copula

The past negative form of 天然放射性同位体

1. Was not a naturally occurring radioisotope.

Past/Perfective
, 
Negative

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天然放射性同位体じゃなかった

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