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界面 かいめん活性 かっせいでした
kaimenkasseideshita

敬
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Noun
, 
Desu Copula
, 
no-Adjective

The polite past form of 界面活性

1. Was surfactant.; Was surface active.

Past/Perfective
, 
Polite

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界面活性でした

界面活性でした【かいめんかっせいでした】 Activity

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