月经（例假）的来到是女孩青春期中经历的一个重要阶段；它是女孩变为女人的众多生理变化之一。
Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.
她们的首次例假平均也提前三个月。
They were also having their first periods, on average, three months earlier.
例假期间常更换护垫、卫生巾。
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