維持 いじ可能 かのうセル速度 そくどじゃなかったです
ijikanō serusokudojanakattadesu

Noun
Desu Copula

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

1. Could not maintain a safe speed.; Wasn't able to keep up a safe speed.

Past/Perfective
Negative
Polite
Casual Register
Computing