frontier 

  1. 名詞
邊境, 邊疆
新領域
國界, 邊界
/以上複數為"frontiers"/
限定單數the frontier:
(靠近未開發地帶的)邊遠地區
通常為複數"frontiers":
新領域
未完全開拓的領域
通常為複數the frontiers of ...(知識、學科等):

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

  2. 形容詞
邊境的

    同義字詞
borderline,marginal

例句

  1. Alaska , the last frontier .
  2. Frontier team building events are theme-based .
  3. The Voyager 1 has crossed into a new frontier .
  4. I should reach the frontier in about six weeks.
  5. No attempt had been made to hold the frontier .