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海洋 かいよう無 む酸素 さんそ事変 じへんでした
kaiyōmusansojihendeshita

敬
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Noun
, 
Desu Copula

The polite past form of 海洋無酸素事変

1. It was the marine oxygen depletion event.

Past/Perfective
, 
Polite

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海洋無酸素事変でした

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