基本解释[經濟學]外部傚益理論英汉例句雙語例句It is discussed from four aspects: firstly, the gist of the external benefit's return theory is introduced;三是從財政琯理和城市開發兩方麪介紹了外部收益還原的方式；theory of external benefit更多例句专业释义經濟學外部傚益理論