总有一天大姨妈也会离开你
[zŏng yŏu yī tiān dà yí mā yĕ huì lí kāi nĭ]
An interestingly humorous remark referring 'Aunt Flo' (colloquial term often used when talking about menstrual cycles). Implies even something seemingly constant or inconvenient will eventually cease or leave one's life.