杀鸡焉用牛刀

Explanation: Why should kill the chicken slaughtering knife. Metaphors do not need to spend great efforts to do the little things. 　　Usage: Complex sentence; as the predicate clause; metaphor do not need to spend great efforts to do the little things 　　Source: Pre-Qin Confucian "Analects, XVII": "Master, smile and laugh, saying: 'Cut the chicken Yanyong chopper!'" 　　Examples: "~"? Swinhoe personally do not work, I cut Zhongzhu Hou heads, such as Tannangquwu ears. (Ming Luo, "Three Kingdoms" The Fifth)