frontier
英 ['frʌntɪə; frʌn'tɪə]
美[frʌn'tɪr]
	    - n. 前沿;边界;国境
 - adj. 边界的;开拓的
 - n. (Frontier)人名;(法)弗龙捷
 
英英释意
- 1. a wilderness at the edge of a settled area of a country;
 - "the individualism of the frontier in Andrew Jackson's day"
 
- 2. an international boundary or the area (often fortified) immediately inside the boundary
 
- 3. an undeveloped field of study; a topic inviting research and development;
 - "he worked at the frontier of brain science"