| 单词 | frontiers | 
| 释义 | frontiernoun  fron·tier  ˌfrən-ˈtir   ˈfrən-ˌtir,  frän-ˈtir,  ˈfrän-ˌtir 1   a     : a border between two countries  the frontier between Canada and the U.S.    b    obsolete   : a stronghold on a frontier   2   a     : a region that forms the margin of settled or developed territory  were sent on an expedition to explore the western frontier    b     : the farthermost limits of knowledge or achievement in a particular subject  frontiers in immunology    c     : a line of division between different or opposed things  the frontiers separating science and the humanities    d     : a new field for exploitative or developmental activity  … the brain lies before us as one of the last scientific frontiers here on earth.    frontier adjective   frontiers nounas in borders   a region along the dividing line between two countries the Apaches were once feared on both sides of the U.S.-Mexico frontier   Synonyms & Similar Words Relevance     
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