Qitou material means just the right material, and five-clawed pig means a pig with five hooves. The literal explanation of this sentence is that a professional carpenter will not use wood of just the right length, and if a butcher sees a pig with five hooves, he will not kill it.

In the past, carpenters and butchers were also craft jobs, and people respected these two professions. Carpentry is a very detailed and professional job. When choosing wood, you usually don’t choose just the right length, but leave a few centimeters extra.

This way, if something unexpected happens halfway through, there is still room for remediation. In the end, if it's too long, it just needs to be sawed off, but if it's too short, it's not that easy to fix.

This is the main reason why carpenters don’t choose just the right length. In the past, the reputation of a carpenter was very important. If one's reputation was damaged because of such a small problem, it would be more than worth the loss.

Pigs generally have four hooves, but some pigs are strange and have five hooves. When a butcher sees a pig with five hooves, he usually won't kill it. People in the past thought it was the incarnation of the "five-clawed golden dragon". This is a very noble thing, and it is very rare.

People enshrine the five-clawed golden dragon as a sacred object, so how could they kill them? Once you touch these sacred objects, you will definitely be punished by God in the future. The second half of this sentence naturally has a certain superstitious flavor and has no scientific basis.

In fact, later generations use this sentence more in the extended meaning of this sentence, which means that it is better to leave a little room for being a human being. No matter what you say or do, don't be too decisive. Sometimes, if you don't care and say some unpleasant things, you may end up pushing yourself into a dead end.