a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
prepuberty详细解释
pre.pu.ber.ty n.（名词）The period of life immediately before puberty, often marked by accelerated physical growth.青春期前时期：青春期前不久的一段生活，特征常为快速的身体生长 【引伸】 prepu.bertal 或 prepu.beral
