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放射 ほうしゃ性 せい崩壊 ほうかい系列 けいれつだった
hōshaseihōkaikeiretsudatta

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Noun
, 
Da Copula

The past form of 放射性崩壊系列

1. Was a radioactive decay series.

Past/Perfective
, 
Physics

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放射性崩壊系列だった

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