直接徵收 間接徵收 國有化 國際最低標準 公共目的原則 非歧視原則 補償原則 卡爾弗理論 自然資源永久主權 伊朗與美國索償法庭 國際投資爭端解決中心 雙邊投資保障協定 北美自由貿易協定 Direct expropriation Indirect expropriation Nationalization International minimum standards Principle of public purpose Principle of non-discrimination Principle of compensation Calvo Doctrine Permanent sovereignty over natural resources Iran-United States claims tribunal International centre for settlement of investment disputes Bilateral investment treaties North American free trade agreement