1. Frontier towns; frontier law. 
   边境城镇；边境法规
2. The armed forces have improved such facilities for preparation against war as air traffic control and frontier defense roads, in order to support the development of the civil transportation. 
   加强空中交通管制和边防公路等战备设施建设，支持民用交通运输业的发展。
3. A wide-open frontier town. 
   法律不严的边远小镇
4. Push society past the frontier. 
   将社团组织扩大到边境地区
5. Fortifications that made the frontier inviolable. 
   边疆上牢不可破的防御工事

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• 1. 边境贸易
  *frontier trade 边境贸易...*frontier traffic 边境贸易...*frontier worker 边境工人
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