Most girls acquired the knowledge about menstruation from their mothers and classmates.
高中女生获得月经知识和帮助的主要来源是母亲和同学朋友。
参考来源 - 上海市高中女生月经病相关症状流行特征—《中国学校卫生》—2007年第5期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
Menstruation may cease when a woman is anywhere between forty-five and fifty years of age.
月经可能在女性45至50岁之间停止。
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.
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。
Women, during menstruation, should use clean, soft cloth or sanitary napkins.
女士在月经期间应该选用干净、柔软的软布或卫生巾。
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