The expert who knows cattle is an idiom in China, pronounced as páo dīng Jiniú, which means that after repeated practice, he has mastered the objective laws of things, and is handy in doing things and using them freely.

From Zhuangzi's Master of Health Preservation. Explain that things in the world are complicated. As long as you practice repeatedly and master its objective laws, you can solve it easily, freely and easily. The article narrates and discusses alternately, with distinct levels. When writing about slaughtering cattle, the movements are beautiful and the skills are superb; After success, the ambition, lofty sentiments, lifelike and fascinating. The language is vivid and vivid, and the idioms "I can't see the whole cow", "I'm very comfortable", "I'm eager to get to the point" and "I'm an expert in understanding cows" all come from this article.

Xieniu by a skillful craftsman is the work of Zhuangzi (Zhuang Zhou), a representative of Taoism in the pre-Qin period. This is a fable, originally intended to illustrate the way of keeping in good health. This paper first describes my superb skills in understanding cows, and then expounds his way of understanding cows, thus revealing the truth that people should conform to the laws of nature. The article uses a variety of writing techniques, with rigorous structure and vivid and concise language, which embodies the wanton features of Zhuangzi's Wang Yang.