ㄖㄨˋㄒㄧㄤㄙㄨㄟˊㄙㄨˊrùxiāng‑suísú

入乡随俗
  1. 一個鄉里當地風俗行事 入鄉隨俗老外跟著登門拜年」。

When you enter a village, follow the local customs (idiom)​; do as the natives do, When in Rome, do as the Romans do
sich den lokalen, örtlichen Gepflogenheiten anpassen