The time during and near a woman's menstrual period when conception is least likely.
（妇女最不可能致孕的）安全期
Example sentencesExamples
The Biblical description of ‘spilling seed,’ or withdrawal, has its place as do items for trying to find the rhythm in the method of measuring safe periods for copulation without conception.
Even in cases of unprotected sex, or contraceptive failures such as condom slippage, rupture, or miscalculation of safe periods, emergency contraception can be highly successful at preventing possible pregnancies.
We know, however, that young users of rhythm typically cannot correctly identify their ‘safe periods’, suggesting the usefulness of increased education about this technique's lack of efficacy among teens.
Given that we were 38 weeks pregnant, it was still a very safe period.