~に~かい(~に~回)      => Do ~ times in ~ period N5
Frequency
中 => While (Lasting) N3
Continuous
折には => when the chance to 〜 comes N2
途中で/途中に => on the way; in the middle of ~ N4
中 => During the period (Term) N3
Time
[折「おり」]には => When A, at the time A N2
Time, Situation
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
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
(の中)で~が一番~です => out of this group, [A] is best N5