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セシウム１ いち３ さん７ ななでした
seshiumuichisannanadeshita

敬
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Noun
, 
Desu Copula

The polite past form of セシウム１３７

1. It was cesium-137.

Past/Perfective
, 
Polite
, 
Chemistry

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セシウム１３７でした

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