不敢问津

Explanation: Interested: Ask Ferry, ask for directions. Refers to the noble, esoteric things not to interfere or attempt. 　　Usage: Verb-object type; for the predicate; containing derogatory 　　Source: Pre-Qin Confucian "Analects XVIII,": "Long Ju Jie female lotus and farming, Confucius had it, so hermits Yan."