維持 いじ可能 かのうセル速度 そくどじゃないです
ijikanō serusokudojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 維持可能セル速度

1. It's not a maintainable speed.; It's not a speed that can be maintained.

Negative
Polite
Casual Register
Computing