中 => While (Lasting) N3
Continuous
途中で/途中に => on the way; in the middle of ~ N4
中 => During the period (Term) N3
Time
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
を中心に => focused on; centered on~ N2
~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
んだった => If... (express regret) N2
Regret
最中に => while; during; in the middle of ~ N3
~いかんだ / いかんで、~ /  ~いかんによって、~ => It depends ... N1
Related, corresponding
んだって => Hear that~ N3
Information, Report
途中 (は) => on the way; in the middle of ~ N3
Halfway
中 => Throughout, all over, during the course of N5
Time