唇腐齿落

Explanation: Very assiduous reading Fengsong metaphor. 　　Source: Han Dongfang Shuo, "Difficult to answer," this son of Mr. repair surgery doctor, meaning saint Mu, Feng Song hundred words of poetry and literature, can not win in mind, with the Bamboo and Silk, lips and teeth rot down, but not adhering to the release. " 　　Examples: More established minority, once to several million words. Resulting in academic difficulties dawn, chant the virtual Q & A, ~ and I do not know benefits. ★ "A Chi Sui"