safe period
noun [ S ] uk/ˈseɪf ˌpɪə.ri.əd/ us/ˈseɪf ˌpɪr.i.əd/
安全期（女性经期前或经期中最不易受孕的几天）
the few days just before and during a woman's period when she is unlikely to become pregnant
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。