挈瓶之知

Explanation: Pull out bottles: the Kap Shui with the bottle, how much water it is not installed. Metaphor of knowledge is shallow and not well aware of the affair. 　　Source: "Zuo Zhao Gong seven years," although the pull out bottles of knowledge (wisdom), defensive prostheses, Li Ye. "" Warring Zhao policy a "person has made, pull out bottles of knowledge (wisdom), not the fall of devices."