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R.S.V.P.
[R.S.V.P. 词源字典]
also
RSVP
, c. 1845, from French initialism (acronym) of
répondez, s'il vous plait
"reply, if you please," as it might have been written on a letter or envelope.
[R.S.V.P. etymology, R.S.V.P. origin, 英语词源]