frontier

美音音标: ['frʌntɪə(r)] frontier
英音音标: ['frʌntɪə(r)] result.0.expl|add:"

同义
frontier
词性
n
解释
a wilderness at the edge of a settled area of a country
示例
the individualism of the frontier in Andrew Jackson's day

同义
frontier
词性
n
解释
an international boundary or the area (often fortified) immediately inside the boundary
示例
None

同义
frontier
词性
n
解释
an undeveloped field of study; a topic inviting research and development
示例
he worked at the frontier of brain science