推論すいろん
suiron

Noun
Suru Verb
no-Adjective

1. inference; deduction; induction; reasoning

Transitive
言語げんごがどのようにはじまったのかについてはいくつも推論すいろんはあるが、実じつはだれもあまりらない。
gengoga dono yōni hajimatta nokani tsuitewa ikutsumo suironwa aruga jitsuwa daremo amari shiranai.
There are many guesses about how language began, but the fact is that no one really knows.