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    unheard of

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    unheard of

    Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++unˈheard of, unheard-of adjective  UNUSUALsomething that is unheard of is so unusual that it has not happened or been known before 前所未闻的，空前的 Travel for pleasure was almost unheard of until the 19th century. 旅游在 19 世纪以前几乎闻所未闻。
    unˈheard of adjectiveChineseSyllable


    unheard of
    unˈheard of , unheard-of adjective
    something that is unheard of is so unusual that it has not happened or been known before:
        Travel for pleasure was almost unheard of until the 19th century.