The expert who knows cattle is an ancient idiom of China, which comes from a fable in Zhuangzi's Southern Classic. An expert (chef) killed cows for Wei Huiwang, and took the opportunity to tell the truth about Taoist health. Metaphor after repeated practice, grasp the objective laws of things, do things with ease and use them freely.

Excerpt from the original text: My master is Wen's solution. He touched him with his hands, leaned against him, walked with his feet, stood on his knees and played with him with a knife, all of which were tenors: the first classic encounter in the dance of mulberry trees. Wen said, "Hey, good! So much for technical coverage? " . Know the cow by cleverness, from Zhuangzi. Internal chapters. Master of health. "