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)
