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单词 first menstruation
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Osmosis-生殖

Primary amenorrhea is when a female hasn't had her first menstruation, called menarche, by age 16, despite normal growth and having started puberty.

原发性闭经指女性在16周岁前没有初次月经(即初潮),尽管生长发育、进入青春期均无异常。

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