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1. Oxford Dictionary

   frontier

   • IPA[ˈfrʌntɪə]

   英式

   • n.
     a line or border separating two countries；the extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before Pacific settlement

   • noun: frontier, plural noun: frontiers

2. • 釋義

   n.

   名詞

   • 1. a line or border separating two countries international crime knows no frontiers France's frontier with Belgium
   • ▪ the extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before Pacific settlement his novel of the American frontier
   • ▪ the extreme limit of understanding or achievement in a particular area the success of science in extending the frontiers of knowledge