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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 たいじゃなかったです
tennenhōshaseidō itaijanakattadesu

敬
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Noun
, 
Desu Copula

The polite, past negative form of 天然放射性同位体

1. Was not a naturally occurring radioisotope.

Past/Perfective
, 
Negative
, 
Polite
, 
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天然放射性同位体じゃなかったです

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