扣盘扪烛

Explanation: Button: knock; palpable: touch. Metaphor without practice, knowledge-sided, it is difficult to get true knowledge. 　　Usage: Joint type; as predicate; metaphor understanding of one-sided, without the essentials 　　Source: Song Su "day metaphor": "Health and subtle Japanese who did not know, ask the person there for. Or divisions, called: 'days like a copper." Buckle _set_ and obtaining the sound. Wen Zhong future, that day also. or divisions, called: 'the light of day, such as candles. "palpable candle derives its shape. future hides the key, that day also." Thesaurus:  Koupanmenyue