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並前往https://www.stanfordchildrens.org/en/topic/default?id=menstrual-cycle-an-overview-85-P00553

Menstrual Cycle: An Overview - Stanford Children's Health

When does menstruation start? On average, a young woman in the U.S. has her first menstrual period at about age 12. This is generally 2 to 3 years after her ...

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