中流一壶

Explanation: Pot that gourd classes, faculties can not Shen. Analogy precious rare. 　　Usage: Partial official; as object, attribute; with commendatory 　　Source: "He Guan Zi learning" in the river lost ship, a pot daughter. " 　　Examples: Holding on with this, do not fall correction excited, but also sufficient for the ~. ★ Qing Li Chi-ming, "read Yueman Hall secretary Yu F, Compilation of Miscellaneous"