The idioms "You can't see the whole cow" and "You can handle it well" both come from the article "My Skillful Knowledge of Cows" in Master Zhuangzi, and both are used to describe the extremely skilled level of technology. The author uses those two idioms to refer to the skills of understanding cows. When I think of these two idioms, I can't help but refer to the article "My Clever Cow Knows the Tao", which tells us that my Clever Cow Knows the Tao from "What I see is nothing but a cow" to "nineteen years, and the blade is as new as new", which gives people an inspiration. Everything has its objective laws. After repeated practice, you can accumulate experience, understand and master the laws of things, such as solving cows. After diligent study and hard practice, you can be "comfortable". When I first learned about cows, "what I saw was nothing more than cows". Like ordinary people, there was nothing particularly outstanding; But three years later. The situation is very different; "I've never seen a whole cow", "There is room for its recovery", a knife has been used for 19 years, "and if the blade is newly developed" ... it shows that my understanding of cattle is brilliant. If my master doesn't study hard, or practice blindly without paying attention to methods, or "follow nature" or "because it is nature", then he is still just an ordinary chef, and he will also "get a knife in the moon". Therefore, there are many reasons why I am skilled; First, of course, it is skilled and hard-working skills; The second point, which is more important, is that he groped for the law of understanding cows in the process of practice, "approving big and guiding big". You can't succeed if you practice hard and don't find its general rules. To understand cows, we need to find out the rules. Why not do other things? Everything has general and special laws. Whether it is general or special, it is much easier to find out this law, master it, do this kind of thing or know similar things. However, it is not easy to find the law. It took me three years as a skilled worker to learn about thousands of cows from "only seeing cows" to "only seeing cows". To a relaxed degree. This shows that to master the laws of things, we must practice a lot, practice repeatedly, learn from them, accumulate experience and find out the laws. It suddenly occurred to me that some newspapers said that in learning mathematics, we should do fewer problems and summarize more. I have some objections to this. The so-called summary is to sum up experience; But where did you get the experience without practice? Of course, the so-called doing more exercises is not to engage in "sea tactics", but to properly choose different types of topics to do. Think again after doing it well and find out the general methods to solve this kind of problems. This is to find the law-you won't be helpless when you encounter the same type of problems in the future, but if you don't do more exercises and sum up your experience properly, you won't be impressed after all, and you won't be able to learn math well. In short, we should practice hard and study skillfully.