n.natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)
同义词：rhythm method of birth controlrhythmcalendar method of birth controlcalendar method
Rhythm Method
Rhythm Method
Rhythm Method
Music reproducing system, rhythm analyzing method and storage medium
Fertility awareness: jet-age rhythm method?
On the possibility of a perfect rhythm method of birth control by periodic light stimulation.
Writing Rhythm: Movement as Method
The clinical effectiveness of the rhythm method of contraception
The Rhythm Method: A New Method for Measuring Cognitive Load—An Experimental Dual‐Task Study
Statistical evaluation of the rhythm method.
Random tie rhythm pattern method and apparatus
The Rhythm Method and Embryonic Death
The Ronnie Gardiner Rhythm and Music Method – a feasibility study in Parkinson’s disease
