“州与州之间的”可以翻译为“between states” 或 “among states”(当涉及三个及以上州时,“among states” 更合适,不过日常语境中“between states” 也常被用于泛指多个州之间的关系 )。例如:
There are some economic differences between states.(州与州之间存在一些经济差异 。)
The cooperation among states in this region is crucial for development.(这一地区州与州之间的合作对发展至关重要 。)