There are some languages where deploying one tiny little phrase unlocks doors.

It’s a phrase that “makes Japan go around,” according to Shihoko Goto, senior associate at the Woodrow Wilson Center, a US think tank, referring to a commonplace (yet ambiguous) Japanese phrase: ‘yoroshiku onegaishimasu’.
 It’s a crucial, constantly used term in Japan heard every single day in thousands of contexts.
But it’s really hard to come up with a simple, easily translatable definition.
 And some foreigners might find it completely baffling.
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