1. 名詞
   frontier複數:邊境, 邊疆
   新領域
   國界, 邊界
   通常為複數:
   新領域
   未完全開拓的領域
   通常為複數the frontiers of ...(知識、學科等):
   ...的新領域
   

   同義字詞
   border,borderland,march
   backcountry,backland(s),backwater,backwoods,bush,hinterland,outback,up-country
   

例句

1. Its frontiers were to be determined later.
2. Ideas, as everyone knows, have no frontiers .
3. Savages on the Frontiers of Europe Chapter 12.
4. I like to call it "La musique sans frontiers .
5. The frontiers of science and technology are vast.
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