維持 いじ可能 かのうセル速度 そくどではありませんでした
ijikanō serusokudodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 維持可能セル速度

1. Was not a maintainable/sustainable speed.; Was not a speed that could be maintained.

Past/Perfective
Negative
Polite
Formal Register
Computing