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重 じゅう酸素 さんそではありませんでした
jūsansodewārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of 重酸素

1. Was not heavy oxygen.; Was not deuterium.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register

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重酸素ではありませんでした

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