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  1. Oxford Dictionary

    last frontier

    • n.
      a part of a country, region, etc. that is the last to be settled, explored, or developed；a nickname for the state of Alaska

    • noun: last frontier, plural noun: last frontiers

    • 釋義

    名詞

    • 1. a part of a country, region, etc. that is the last to be settled, explored, or developed the deep ocean is the last frontier of exploration on this planet
    • ▪ a nickname for the state of Alaska
    • ▪ the extreme limit of understanding or achievement in a particular area one of the last frontiers of rock 'n' roll has been instrumental music