noun🔗Share국경The part of a country which borders or faces another country or unsettled region""The soldiers guarded the country's frontiers against any possible invasion from neighboring nations." "군인들은 이웃 국가들의 침략으로부터 국가의 국경을 지켰다.geographynationareapoliticsstateChat with AIVocabulary GamePractice Reading
noun🔗Share최전선, 최첨단The most advanced or recent version of something; leading edge."the frontier of civilization"문명의 최전선technologyscienceachievementChat with AIVocabulary GamePractice Reading
noun🔗Share전초 기지An outwork of a fortification."The soldiers patrolled the frontiers of the castle's outer wall, watching for enemy movements. "병사들은 적의 움직임을 감시하며 성의 외벽 전초 기지를 순찰했다.militaryarchitecturewarChat with AIVocabulary GamePractice Reading
