frontier
noun [ C ] uk/ˈfrʌn.tɪər/ /frʌnˈtɪər/ us/frʌnˈtɪr/
C2 [ C ]国境，边境
a border between two countries
Some of the frontier between Germany and Poland follows the course of the river Oder. 德国与波兰的部分边界是沿奥德河划分的。
Nepal has frontiers with both India and China. 尼泊尔与中国和印度都接壤。
They lived in a town close to the frontier. 他们居住在一个离边界很近的城镇。
[ S ]（十九世纪时定居者开始搬入并居住的美国西部）前沿地带
the western US where settlers began to move to live in the 19th century
The Homestead Act of 1862 gave free land to pioneers who settled the frontier. 1862年的《宅地法》免费把土地给予到西部前沿地区定居的先驱者。
- More examples
- The frontier is patrolled by border guards.
- At the frontier, there were people pestering tourists for cigarettes, food or alcohol.
- Two armed men were caught trying to cross the frontier at night.
- Air pollution is no respecter of national frontiers.
- The president pledged to respect the existing frontiers between the two countries.
Idiom
the frontiers of somethingidiom C2 …的知识前沿；…的疆界
the limits of what is known or what has been done before in an area of knowledge or an activity
the frontiers of science and technology 科技前沿