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fron·tier AHD[frŭn-tîrʹ, frŏn-, frŭnʹtîr', frŏnʹ-] D.J.[frʌnˈtɪə, frɒn-, ˈfrʌnˌtɪə, ˈfrɒn-]K.K.[frʌnˈtɪr, frɑn-, ˈfrʌnˌtɪr, ˈfrɑn-]n.（名词）- An international border.国界：国家间的界线
- The area along an international border.See Synonyms at boundary 边境：沿国界的地区 参见 boundary
- A region just beyond or at the edge of a settled area.边缘地带：刚刚超出或恰好在某特定地区的地带
- An undeveloped area or field for discovery or research:开发地区边缘：有待于开发研究的不发达地区或领域：theories on the frontier of astrophysics.关于天体物理学新领域的理论
n.attributive.（定语名词）- Often used to modify another noun:修饰词：常用以修饰另一个名词：frontier towns; frontier law.边境城镇；边境法规
- Middle English frountier 中古英语 frountier
- from Old French frontier 源自 古法语 frontier
- from front [forehead, front] * see front 源自 front [前额，前面] * 参见 front
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