What does sparsity mean in ancient Chinese?

Shangshu is a kind of document form that plays the role of emperor among North Korean officials, such as Jing, etc., to persuade them to correct their political mistakes, "forget the goodness of chariots and horses, reject the empty words of scholars from far away, and roam the skills of emperors": The little Shangshu admonishes "choose scholars from the Ming Dynasty as internal ministers and participate in politics" and "those who can teach are worried about politics"; Xue Xuan became an emperor when he was studying, and reprimanded "the tyranny of many officials and the break of politics and religion", which are all praised historical examples. As for the seal, it is a confidential document for the emperor. There are more than 100 examples of seals in Hanshu. In the Han Dynasty, subjects confided to the emperor a wide range of affairs, among which ethical criticism of the emperor accounted for a prominent proportion. For example, in the Ming Dynasty, Huang Daozhou's Biography of Our Time: "A Jingdemen, Gong (Yuan Keli) neglected Chen Quezheng, such as worshipping in the suburbs, talking about the June 7th event, and the chapter was not finished. "