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》