Its author, Professor Marcia Herman-Giddens, found the average age of puberty among white girls had dropped to 9.7 years.

其作者马西娅•赫曼·吉登斯(Marcia Herman - Giddens)发现白人女孩青春期平均发育年龄下降到9.7岁。

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Its author, Professor Marcia Herman-Giddens, found the average age of puberty among white girls had dropped to 9.7 years.

其作者马西娅•赫曼·吉登斯(Marcia Herman - Giddens)发现白人女孩青春期平均发育年龄下降到9.7岁。

youdao