menstrual age的用法和樣例：
例句
- When they split the women up according to the age they began menstruating, certain gene patterns appeared.
當他們根據月經初潮的年齡將女性分類，某些基因圖譜就顯現了。 - Probability unit regression and multiple regression methods were used to analyze the relationship between average menarche age, sex development and body constitution.
采用概率單位回歸法及多元回歸分析法，進行月經初潮平均年齡及性發育與體質關系的研究。
