◎ 汗牛充栋 hànniú-chōngdòng[enough books to make the ox carrying them sweat or to fill a house to the rafters—an immense number of books] 形容书籍存放很多。用牛运输,牛累得出汗;书堆满屋子,顶到栋梁 又有徒党传习,日不 暇给,又其书汗牛充栋。——宋· 陆九渊《与林叔虎书》-----------------国语辞典：形容书籍极多。参见「充栋汗牛」条。《聊斋志异．卷五．封三娘》：「世传养生术，汗牛充栋，行而效者谁也？」反凤毛麟角