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。
2
How do you combine the splendours of the suburban backyard with the social intensity of urban density?
怎样将郊区后院的辉煌与都市密度造成的群居强度结合呢？
3
MRI (magnetic resonance imaging) scans of the men's brains revealed a strong link between those who valued social bonds with others and the density of grey matter in the two brain regions.