The educational investment really has a social effect of repressing the population growth. 教育投资确实具有抑制人口增长的社会效应。
Surprisingly, sadness made very little headway within social networks, paling in comparison to the communal effects of happiness. 令人意外的是,跟幸福感的社会效应比起来,悲伤感在社交圈里是处处碰壁。