を中心に => focused on; centered on~ N2
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
間 => while; during; between ~ N4
中 => While (Lasting) N3
Continuous
間に => while; during~ something happened N4
瞬間 => At the very moment N3
Short period of time
途中で/途中に => on the way; in the middle of ~ N4
中 => During the period (Term) N3
Time
[間「あいだ」]/[間「あいだ」]に => During A, During A (before A is finished/over) N2
Time, Situation
最中に => while; during; in the middle of ~ N3
途中 (は) => on the way; in the middle of ~ N3
Halfway
中 => Throughout, all over, during the course of N5
Time