Frontier
01
边疆, 边界
the outer edge of occupied or developed land, beyond which lies unsettled territory
语法信息
有生性状态
抽象
形态构成
简单词
可数
复数形式
frontiers
例子
Pioneers migrated westward, steadily pushing the frontier of settlement into new territories.
先驱者们向西迁移，不断将定居的边界推向新的领土。
02
前沿, 新领域
an undeveloped field of study; a topic inviting research and development
03
边界, 边疆
an area located at a border, where two countries or regions meet
例子
The town lies right on the frontier, making it a strategic location for trade.
该镇位于边境上，使其成为贸易的战略要地。
