yuēdìngsúchéng

== Mandarin == === Romanization === yuēdìngsúchéng (Zhuyin ㄩㄝ ㄉㄧㄥˋ ㄙㄨˊ ㄔㄥˊ) Hanyu Pinyin reading of 約定俗成 / 约定俗成