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TOEFL IELTS BNC: 4553 COCA: 4415
frontier
frʌntɪəʳ -tɪəʳ ˈfrʌntɪə frʌnˈtɪr frɑnˈtɪr
Word forms: plural frontiers
1 N-COUNT 边界;边境 A frontier is a border between two countries. 边界;边境 [British]

  • It wasn't difficult then to cross the frontier.

    那时穿越边境并不困难。

SYN border, limit, edge, bound
in AM, usually use 美国英语通常用 border
2 N-COUNT 西部边疆,边远地区(指 20 世纪前美国西部欧洲移民尚未定居的部分) When you are talking about the western part of America before the twentieth century, you use frontier to refer to the area beyond the part settled by Europeans. 西部边疆,边远地区(指 20 世纪前美国西部欧洲移民尚未定居的部分)

  • ...a far-flung outpost on the frontier.

    远驻西部边疆的前哨

3 N-COUNT [usually plural, adjective NOUN] (尤指知识的)前沿，尖端，新领域 The frontiers of something, especially knowledge, are the limits to which it extends. (尤指知识的)前沿，尖端，新领域

  • ...pushing back the frontiers of science. [+ of]

    推进科学前沿

  • ...technological frontiers.

    技术尖端

Trends of frontier
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