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单词 safe period
释义

WordReference Random House Unabridged Dictionary of American English © 2024
safe pe′riod, 
  1. Physiologyan interval of the menstrual cycle when fertilization is considered to be least likely, usually a number of days prior and subsequent to the onset of menstruation.
  • 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::
safe period n
  1. informal the period during the menstrual cycle when conception is considered least likely to occur
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