Another study of high school social networks found less bullying and aggression the higher the density of mixed-sex friendships within a given adolescent network.
另一项关于高中社交网络的研究发现，在特定的青少年网络中，异性友谊密度越高，欺凌和攻击行为就越少。
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That brings me to the third area of research which fails to support single-sex schooling and indeed suggests the practice is actually harmful: social developmental psychology.
We showed that three lines of research used to justify single-sex schooling—educational, neuroscience, and social psychology—all fail to support its alleged benefits.