unheard of 的英语意思
unheard ofunˈheard of, unheard-of adjective 
查看全部语言翻译 something that is unheard of is so unusual that it has not happened or been known before指某事极为罕见，以前从未发生过或从未为人所知: 
Travel for pleasure was almost unheard of until the 19th century.以休闲为目的的旅行直到19世纪之前几乎闻所未闻。
查看全部语言翻译 something that is unheard of is so unusual that it has not happened or been known before指某事极为罕见，以前从未发生过或从未为人所知: Travel for pleasure was almost unheard of until the 19th century.以休闲为目的的旅行直到19世纪之前几乎闻所未闻。