月经初潮 meaning in Chinese

menarche

The relationship between bone development , menarche and height spurt among male adolescents
月经初潮与身高突增关系研究
A case - control study on psychological and social factors of urban girls with early menarche
月经初潮早发与社会心理因素关系
Research on menarche and first spermatorrhea of students in guangdong province
广东省中小学生月经初潮与首次遗精年龄现状及趋势分析