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放射 ほうしゃ性 せい崩壊 ほうかい系列 けいれつでした
hōshaseihōkaikeiretsudeshita

敬
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Noun
, 
Desu Copula

The polite past form of 放射性崩壊系列

1. Was a radioactive decay series.

Past/Perfective
, 
Polite
, 
Physics

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放射性崩壊系列でした

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