まぜて一つにすること
He is a monomaniac.
unite into one
without the aid or support of another person
単純なさまの
a thing that is used by only one person
とけて一つになる
鎔けて一つになる
a mature and independent person who is a full-fledged member of society
とりあえず〜しておく
すぐその時
something that occurs immediately after doing something