fron·tier /ˌfrʌnˈtɪr, ˈfrʌnˌ, frɑnˈ, ˈfrɑnˌ/
國境,邊境;尚待開發的領域
frontier
邊緣
frontier
末梢
frontier
邊界
Fron·tier n.
1. That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.
2. Fort. An outwork. [Obs.]
Palisadoes, frontiers, parapets. --Shak.
Fron·tier, a.
1. Lying on the exterior part; bordering; conterminous; as, a frontier town.
2. Of or relating to a frontier. “Frontier experience.”
Fron·tier, v. i. To constitute or form a frontier; to have a frontier; -- with on. [Obs.]
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frontier
n 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"