酢酸 さくさん繊維 せんい じゃありませんでした
sakusansen'isojārimasendeshita

Noun
Desu Copula

The polite, past negative form of 酢酸繊維素

1. Was not cellulose acetate.; Wasn't cellulose acetate.

Past/Perfective
Negative
Polite
Terminal Form