鞭擗向里

Explanation: Means in-depth analysis, so close to the innermost layer. Describe the search for a thorough, in-depth microscopic. With the "whip past in the provision of 　　Source: Song Zhang Shi, "A Hu season with the book": "Scholars are willing to recent scholars of the time to time, but efforts to implement those very rare but also durable. And is to whip Pi to the inside, so getting off work, pain and more self side ears. "