標準 ひょうじゅん光源 こうげんじゃなかったです
hyōjunkōgenjanakattadesu

Noun
Desu Copula

The polite, past negative form of 標準光源

1. Wasn't a standard light source.; Wasn't the standard light source.

Past/Perfective
Negative
Polite
Casual Register
Astronomy