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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 たいではありません
tennenhōshaseidō itaidewārimasen

敬
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Noun
, 
Desu Copula
, 
Negation Auxiliary

The polite negative form of 天然放射性同位体

1. Is not a naturally occurring radioactive isotope.

Negative
, 
Polite
, 
Formal Register

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天然放射性同位体ではありません

天然放射性同位体ではありません【てんねんほうしゃせいどういたいでわありません】 Activity

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