frontier

🇬🇧/ˈfrʌntɪə(r)/ 🇺🇸/frʌnˈtɪr/📚 4466 35 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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