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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 たいでした
tennenhōshaseidō itaideshita

敬
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Noun
, 
Desu Copula

The polite past form of 天然放射性同位体

1. Was a natural radioactive isotope.

Past/Perfective
, 
Polite

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天然放射性同位体でした

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