以羊易牛

Explanation: Easy to replace. To replace the cattle with sheep. Analogy with this instead of another. 　　Source: "Mencius Lianghui Wang's" King sat in the classroom, there are cows and arraigned the next person. ... ... Saying 'what can be spent also to sheep Yasuyuki. '" 　　Examples: Good _select_ion of East-bed has been recruited, how to know ~; west longitudinal responsibility statement, and finally hard to confound right and wrong. ★ Ming Feng Meng, "Awaken the common saying," VII