触类而长

Explanation: Language of the "easy on the copulative": "cited the extension of, touch of class and long, the world as possible and complete carry on." Brief Account Shu: "things that touch every class and growth." Means that the knowledge to master a class of things or law, can accordingly increase the knowledge of similar things. 　　Source: A phrase "easy on the copulative" and extended the lead to touch type and length of, the world as possible and complete carry on. "Brief Account sparse things that touch every class and growth." 　　Examples: The remaining ~, caused by non-a, end by different routes, or text, or quality. ★ San Guowei Kang, "Qin Fu"