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约定俗成
约定俗成
約定俗成
yuē
dìng
sú
chéng
ㄩㄝ ㄉㄧㄥˋ ㄙㄨˊ ㄔㄥˊ
HSK 7-9
1
established by popular usage (idiom); common usage agreement
2
customary convention
Characters
约
定
俗
成