1 General Lü Meng 呂蒙|吕蒙 of the southern state of Wu (idiom); model of self-improvement by diligent study (from unlettered soldier to top strategist of Wu)
封沙育林
fēng shā yù lín
1 to plant trees in order to stabilize sand (idiom)
蜀犬吠日
Shǔ quǎn fèi rì
1 lit. Sichuan dogs bark at the sun (idiom); fig. a simpleton will marvel at even the most common things
2 alludes to the Sichuan foggy weather where it's uncommon to see a sunny day