如果你的朋友和家人发胖了，你也得小心了！一项最新研究表明，肥胖具有“社会传染性”，很容易在人与人之间传播。
If your friends and family get fat, chances are you will too, researchers report in a new study that suggests obesity is "socially contagious" and can spread easily from person to person.
结果就是，一种传染性的兴奋之情在参与者的社会性网络中传播。
The result is a contagious excitement that spreads throughout participants' social networks.
时代和文化差异会让宠物豢养模式变得面目全非，这种模式与时尚潮流（或称之为传染性的社会文化基因）非常近似。
Pet ownership patterns have varied tremendously over time and across cultures and can resemble fads or infectious social memes.
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