音标发音英式音标 [ˈseɪf ˌpɪə.ri.əd]美式音标 [ˈseɪf ˌpɪr.i.əd]英式发音 美式发音 基本解释安全期（女性經期前或經期中最不易受孕的幾天）。同根派生 英英字典劍橋英英字典 the few days just before and during a woman's period when she is unlikely to become pregnant