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red-letter day

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Red-letter \Red"-let`ter\ (-l?t`t?r), a.
   Of or pertaining to a red letter; marked by red letters.

   {Red-letter day}, a day that is fortunate or auspicious; --
      so called in allusion to the custom of marking holy days,
      or saints' days, in the old calendars with red letters.

资料来源 : WordNet®

red-letter day
     n : a memorably happy or noteworthy day
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