粒子 りゅうし相互 そうご作用 さようじゃありませんでした
so ryūshino sōgosayōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 素粒子の相互作用

1. It was not an interaction of elementary particles.; It wasn't a particle interaction.

Past/Perfective
Negative
Polite
Terminal Form