A large 2007 study showed an in the risk of obesity among people whose friends gained weight
问题描述：
A large 2007 study showed an in the risk of obesity among people whose friends gained weight
翻译
答
再一次2007人的大型研究调查中显示：在人群中,那些有体重增加趋势的人的朋友也存在着肥胖的危险!