音标：[ˈfrʌnˌtiəz] ；柯林斯词典等级：2 级；

n. 边界( frontier的名词复数 ); 边境; 开发地区的边缘; 尚待开发的领域

n a wilderness at the edge of a settled area of a country
n an international boundary or the area (often fortified) immediately inside the boundary
n an undeveloped field of study; a topic inviting research and development

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