menstrual age的用法和样例：
例句
- When they split the women up according to the age they began menstruating, certain gene patterns appeared.
当他们根据月经初潮的年龄将女性分类，某些基因图谱就显现了。 - Probability unit regression and multiple regression methods were used to analyze the relationship between average menarche age, sex development and body constitution.
采用概率单位回归法及多元回归分析法，进行月经初潮平均年龄及性发育与体质关系的研究。
