Explanation: However: "burning" of the word, burning; Di: a type of reed plants. Di for the lights burning, strenuously study. Diligent study hard to describe. Source: Northern Qi tui "Family Instructions Mian study" Liang Peng Cheng Liu Qi, Bo cross provincial governor, grandson of early solitary poor family, lights in the difficult, often bought off of size Di, then tomorrow night reading. "