Selected paragraph:
There is a gap between people for a while, but the blade is not thick; Without thickness, there will be room for recovery, so 19 years, the blade is still new.
Translation:
Cows have cracks in their joints and thin blades; If you insert a thin blade into a cracked bone joint, there must be room for the blade to operate! Therefore, for 19 years, the blade was only ground from the grindstone.
Idiom story
Liang has a cook named. Once, he went to see the skilled man slaughter a cow, only to see that he cut off the bones and meat of the cow effortlessly. He only touched it with his hand, leaned against his shoulder, stepped on it with his foot, and leaned against his knee, and heard the sound of separation of flesh and bones. He used the knife properly and his hand fell off the knife very neatly.
Liang was surprised and asked me enviously, "Why is your craft so high?" My master put down the butcher's knife and said to Wen, "I am good at it because I know how to use a knife and apply it to technology." When I first learned to kill a cow, I saw the whole cow in my eyes; Three years have passed, and I have never seen the whole cow again; Now, as long as I feel and use this spirit, I can know that the bones of cows are untied from the natural branches of the sun and the earth, and I don't need to look at cows with my eyes. This is because practice makes perfect. When I use it, I can cut to the key points. Because I am very familiar with the structure of cattle bones and meat, it is very easy. "
Liang asked again, "So, this knife you made must be very sharp?" My technical worker waved his knife lightly and replied with a smile: "Generally, the knives used by cattle butchers need to be changed once a month, because their blades often touch cattle bones. However, my knife has been used for 19 years, killing thousands of cows, but it is still as sharp as new. In fact, the blade is very thin, and there is a gap between the meat and the bone, which is much wider than the blade. It is more than enough to insert such a thin blade! "