基本解释[经济学]外部效益理论[法学]外部效益理论英汉例句双语例句It is discussed from four aspects: firstly, the gist of the external benefit's return theory is introduced;三是从财政管理和城市开发两方面介绍了外部收益还原的方式；external benefit theory更多例句专业释义经济学外部效益理论法学外部效益理论