Idiom meaning: rafters: wooden cases; Pearl: Pearl. Bought a business box and returned the pearls. Metaphor has no vision and improper choice. The source "Han Feizi, the foreign reserve said the top left": "Chu people have sold their pearls to Zheng, which are the cabinets of Mulan, smoked with cinnamon, decorated with pearls, roses and plumes. Zheng Guoren bought the jewelry box and returned the pearls.