平均 へいきん寿命 じゅみょうじゃありませんでした
heikinjumyōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 平均寿命

1. Was not average lifespan.; Was not average life expectancy.

Past/Perfective
Negative
Polite
Terminal Form
Physics