を中心に => focused on; centered on~ N2
~やむをえず  => unavoidable, no other way to do something N2
Necessity, obligation
~のを => Nominalize verbs N5
Nominalization
むりをする => to work too hard, to try too hard, to strain oneself N3
Description
むき => facing towards N3
Direction
むしろ => rather; instead N2
Compare
...はむりだ... => impossible N4
Description
込む => to be crowded N3
なくて済む/ないで済む => get by without doing ~ N2
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
…ばあいをのぞいて => Except for N2
Exception
ものを => Although A, (unfortunate result) B N1
Contrast/Surprise