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
词态变化
复数形式:frontiers
常见例句
1
n a man who lives on the frontier
2
United States frontierswoman and legendary figure of the Wild West noted for her marksmanship (1852-1903)
3
pleaded the cause of the American colonists in British Parliament and defended the parliamentary system (1729-1797) n United States frontierswoman and legendary figure of the Wild West noted for her marksmanship (1852-1903) v murder without leaving a trace on the body v get rid of, silence, or suppress
4
United States frontiersman who guided Fremont's expeditions in the 1840s and served as a Union general in the American Civil War (1809-1868)
5
United States writer who wrote about frontier life (1873-1947)
