frontier
'frʌntjә
基本解释
n. 边界, 边境
[法] 国境, 边境, 边界
英文释义
n. a wilderness at the edge of a settled area of a country
n. an international boundary or the area (often fortified) immediately inside the boundary
n. an undeveloped field of study; a topic inviting research and development
词形变化
上一个单词：fronteras
下一个单词：frontier customs dues