The educational investment really has a social effect of repressing the population growth. 教育投資確實具有抑制人口增長的社會效應。
Surprisingly, sadness made very little headway within social networks, paling in comparison to the communal effects of happiness. 令人意外的是,跟幸福感的社會效應比起來,悲傷感在社交圈裡是處處碰壁。