menstruation月经(学名，俗称大姨妈); menophania 月经初潮; menstrual cycle 月经周期; period经期/例假(口语简称，during/be on one's period来例假); Irregular menstruation/cycles/periods月经失调; Dysmenorrhea 痛经; Menstrual pain/cramps 经痛(正常或非正常疼痛)