India, Pakistan, Afghanistan, and the US form a rectangle of relationships in South Asia, with India, China, and the US constituting a triangle that not only contains the South Asia region, but is also a major theater in an increasingly global struggle. The emerging geopolitical centrality of the Indian Ocean, through which an ever-increasing share of world trade passes, is a third, complicating, factor.
印度、巴基斯坦、阿富汗和美国组成了一个南亚关系矩形，而印度、中国和美国则组成了一个不仅包括南亚，同时也是全球斗争中心舞台的三角。印度洋所浮现出的地缘政治向心力——以其不断增长的世界贸易吞吐份额为表征——是第三大复杂因素。