入境问俗

When you enter a country, enquire about the local customs (idiom); do as the natives do / When in Rome, do as the Romans do

to enter / to go into / to join / to become a member of / to confirm or agree with / abbr. for 入聲|入声[ru4 sheng1]

to enter a country

border / place / condition / boundary / circumstances / territory

to ask / to inquire

to ask; to inquire

custom / convention / popular / common / coarse / vulgar / secular