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半減 はんげん期 きではありませんでした
hangenkidewārimasendeshita

敬
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Noun
, 
Desu Copula

The polite, past negative form of 半減期

1. Was not a half-life.; Was not the half-life.

Past/Perfective
, 
Negative
, 
Polite
, 
Formal Register
, 
Chemistry
, 
Physics

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半減期ではありませんでした

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