残留 性 有機 汚染 物質 でした zan ryūseiyūki osembusshitsudeshita
zan ryūseiyūki osembusshitsudeshita
Noun
, Desu Copula
The polite past form of 残留性有機汚染物質
1. Was persistent organic pollutants.
Past/Perfective
, Polite
Word Pronunciation
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