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Meaning of “frontier” - Learner’s Dictionary

frontier

noun     /frʌnˈtɪər/
[C] a line or border between two countriesTerritorial boundariesCountry and nationContinents and regions of the worldCountry names
the frontiers of sth
the limits of what is known or what has been done before in an area of knowledge or activity: the frontiers of science and technologyDescribing the leading position
(Definition of frontier from the Cambridge Learner’s Dictionary © Cambridge University Press)
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There, their and they’re – which one should you use?
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by Liz Walter If you are a learner of English and you are confused about the words there, their and they’re, let me reassure you: many, many people with English as their first language share your problem! You only have to take a look at the ‘comments’ sections on the website of, for example, a popular

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