frontier/frʌnˋtIr; ˈfrʌntIə/n [C] 1 especially BrE the border of a country【尤英】边界﹐边境: +between/with a town on the frontier between France and Spain 法国和西班牙边境的一座小镇2 the frontiers of knowledge/science etc the limits of what is known about something 知识/科学等的前沿