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栋：栋宇，屋子。书运输时牛累得出汗，存放时可堆至屋顶。形容藏书非常多。
[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》
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