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放射 ほうしゃ性 せい同位 どうい元素 げんそじゃなかった
hōshaseido ui gensojanakatta

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Noun
, 
Da Copula

The past negative form of 放射性同位元素

1. Was not a radioisotope.; Wasn't a radioactive isotope.

Past/Perfective
, 
Negative
, 
Physics

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放射性同位元素じゃなかった

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