酢酸 さくさん繊維 せんい ではありませんでした
sakusansen'isodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 酢酸繊維素

1. Was not cellulose acetate.; Was not made of cellulose acetate.

Past/Perfective
Negative
Polite
Formal Register