但这项研究也发现那些拥有沙漏形身材的少女妈妈生出的孩子不存在认知发展缓慢的问题，他们在认知测试中表现良好。
The study noted however that children born to teenage girls with traditional hourglass figures seemed to be protected from this phenomenon and did better in tests.
如果你观察一个四岁的孩子，例如我四岁的女儿，你可能要先研读皮亚杰的认知发展阶段理论，这一理论是我们在课堂上讲过的。
If you observed a four-year-old child, for example, my daughter is 4 years old; you might read up on Piaget's stages of cognitive development we covered those in class.
经常被用来为单性别教育辩护的第二条研究路线恰恰在我的专业领域之内：大脑和认知发展。
The second line of research often used to justify single-sex education falls squarely within my area of expertise: brain and cognitive development.
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