frontier
🇬🇧/ˈfrʌntɪə(r)/ 🇺🇸/frʌnˈtɪr/📚 4466 22 2四级六级考研托福雅思高考The frontiers of something, especially knowledge, are the limits to which it extends. (尤指知识的) 前沿
noun [具体名词]边境，国界；(常sing.) 西部边疆，边远地区；（尤指知识的）前沿，新领域；西部边疆，边远地区
It wasn't difficult then to cross the frontier. 那时候穿越国界并不难。
adjective [原级]边境的，边疆的
The rebels control the frontier and the surrounding area. 叛乱分子控制了边疆地区。
- frontier 出现在下面的课文中
- Lesson21 Williams S. Hart and the early 'Western' film
the border / frontier between China and Russia
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