汗牛充棟（汗牛充棟）　

◎ 汗牛充棟 hànniú-chōngdòng

[enough books to make the ox carrying them sweat or to fill a house to the rafters—an immense number of books] 形容書籍存放很多。用牛運輸,牛累得出汗;書堆滿屋子,頂?shù)綏澚?

又有徒黨傳習(xí),日不 暇給,又其書汗牛充棟。——宋· 陸九淵《與林叔虎書》