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。
Studies in countries such as Ghana and Cameroon suggest many girls at secondary school miss a week of classes when they have their period, or drop out altogether when they reach puberty.
在加纳和喀麦隆等国家开展的研究显示，许多女中学生在例假期间一个星期不去上学，当她们进入青春期，有的甚至辍了学。
Girls have a growth spurt that slows down with the onset of their first period (for boys, weight and height come in the final stages of puberty).
女孩在首次例假会经历发育激增，之后才会放缓(对男孩来说，体重与身高处于青春期发育最后阶段)。
Puberty is the crucial period for formation of somatotypes.
青春期是形成体型的关键时期。
The period between childhood and the onset of puberty, often designated as between the ages of 10 and 12 in girls and 11 and 13 in boys.
从儿童到青春期开始这段时间，年龄上女孩通常认为是从10岁到12岁，而男孩则通常从11岁到13岁。
Young people go through a period of fast growth, called puberty.
青少年会经历一段快速成长期，称为青春期。
The period between childhood and the onset of puberty, often designated as between the ages of10 and12 in girls and11 and13 in boys.
青春前期从儿童到青春期开始这段时间，年龄上女孩通常认为是从10岁到12岁，而男孩则通常从11岁到13岁。
The period between childhood and the onset of puberty, often designated as between the ages of10 and12 in girls and11 and13 in boys.
青春前期从儿童到青春期开始这段时间，年龄上女孩通常认为是从10岁到12岁，而男孩则通常从11岁到13岁。
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