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| NOUN |
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| /frʌnˈtɪə/ |
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| /ˈfrʌntɪə/ |
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| 1 | C a border between two countries, especially one with official points where people or vehicles cross 边境；国界 |
| +between the frontier between Israel and Lebanon 以色列和黎巴嫩的边界 |
| +with Italy’ s frontier with Switzerland 意大利与瑞士的边界 |
| on/at the frontier troops massing at the frontier 在边境集结的部队 |
| | 1a | C the outer edge of a country or area that is the furthest point where people have started to live and build towns 边疆 | |
| | 1b | singular the western edge of the US that Europeans had reached in the 17th, 18th, and 19th centuries （17至19世纪欧洲移民来到的美国西部的）边远地区 | |
| | 1c | on or relating to a frontier 边境的；边界的；边疆的 | | frontier controls 边境管制 | | a frontier town 边境城镇 | | frontier post (=official place for crossing) Armed police manned the frontier post. 边境口岸 | |
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| 2 | C usually plural the most advanced or recent ideas about something （思想的）前沿；（知识的）新领域 |
| the frontiers of knowledge/science/technology Their work was on the frontiers of science. 他们的工作是有关尖端科学的。 |
| extend/push back the frontiers (=discover more) We are dedicated to experimentation, to pushing back the frontiers. 开拓新的知识领域 |
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