three-edged rule

例句：

1. 1.The three-edged rule of international law is that states must respect each other's sovereignty and territorial integrity.
   国际法的三刃剑规则是，国家必须尊重彼此的主权和领土完整。
2. 2. The three-pronged approach to solving the problem involves identifying the root causes, developing a comprehensiveplan, and implementing it effectively.
   解决这一问题的三重奏方法包括识别根本原因、制定全面计划并有效实施。
3. 3.The three-pronged approach to innovation requires collaboration between different sectors, investment in research and development, and support for entrepreneurship.
   创新的三重奏方法要求不同部门之间的合作、对研发的投资以及对企业创业的支持。