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当一个女婴降临人世,她的体内就已具备了一套完整(但未成熟)的女性生殖系统。当女孩长到12岁左右,青春开始萌动,下丘脑——
When a baby girl is born, her body has a complete (but immature) female reproductive system. When the girl grows to 12 years old, youth begins to sprout, the hypothalamus -