词汇 | unheard of |
释义 | unheard ofunˈheard of, unheard-of adjectiveadj 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。 |
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