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人工 じんこう放射 ほうしゃ性 せい同位 どうい体 たいでした
jinkōhōshaseidō itaideshita

敬
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Noun
, 
Desu Copula

The polite past form of 人工放射性同位体

1. Was artificial radioactive isotope.

Past/Perfective
, 
Polite

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人工放射性同位体でした

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