一体 => …the heck; …in the world; …on earth N3
受身形 => Passive voice N4
を中心に => focused on; centered on~ N2
~V使役受身      => causative-passive form N4
Conjugate verbs
一緒に => together N5
一度に => all at once N3
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
一通り => Basically, (get) over, done N2
Base, base
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
一方だ => more and more; continue to ~ N2
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
一応 => more or less; pretty much; roughly; tentatively ~ N2