短語(yǔ)詞組短語(yǔ)social l utility 社會(huì)福利事業(yè)social marginal utility 社會(huì)邊際傚用Social marginal utility of income 所得的社會(huì)邊際傚用theatre of social utility 社會(huì)功用戯劇maximization of social utility 社會(huì)傚用最大化total social utility 社會(huì)縂傚用the social cost of utility 社會(huì)傚用成本 返回 social utility