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質量 しつりょうエネルギーでした
shitsuryōenerugiideshita

敬
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Noun
, 
Desu Copula

The polite past form of 質量エネルギー

1. Was mass-energy.

Past/Perfective
, 
Polite
, 
Physics

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質量エネルギーでした

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