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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でした
tennenhōshaseidō itaidewārimasendeshita

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 natural radioactive isotope.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register

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天然放射性同位体ではありませんでした

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

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