壊変 かいへん毎秒 まいびょうではありませんでした
kaie mmai byōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 壊変毎秒

1. Was not decaying per second.; Was not deteriorating per second.

Past/Perfective
Negative
Polite
Formal Register
Physics