[{"title":"( 2 个子文件 21.55MB ) 数学分析(梅加强+张筑生两本)","children":[{"title":"数学分析","children":[{"title":"数学分析 梅加强.pdf <span style='color:#111;'> 3.19MB </span>","children":null,"spread":false},{"title":"数学分析(张筑生).pdf <span style='color:#111;'> 19.99MB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]