| 单词 | frontier |
|---|---|
| 音标 | [ˈfrʌntɪə(r)] [frʌnˈtɪr] |
| 释义 | n.["边疆，边境","边界，边缘","尚待开发的领域"] adj.["边疆的，边界的","新垦地的，边地的","开拓的"] |
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