N2 — outside your level filter
を中心に
centred on N; with N at the heart of it
この町は駅を中心に発展してきた。
kono machi wa ekiochuushinni hatten shite kita.
This town has grown up centred on the station. neutral
このアプリ、若い子を中心にはやってるらしいよ。
kono apuri, wakai ko o chuushin ni hayatteru rashii yo.
Apparently this app is catching on mostly among younger kids. casual