Idiom story handy, right?
[Interpretation] The blade runs in the joint space, and there is room for manoeuvre. Metaphor is skilled in work, has practical experience, and has no troubles in solving problems.
[Source] The language "Zhuangzi, Master of Health Preservation" says: "Those who have a festival have a room, but the blade is not thick. Without thickness, there is room for recovery. "
This is an idiom story, which comes from "My skillful hands help cows"
Liang has a good cook. Once, he went to see the skilled worker slaughter a cow, only to see that he cut off the bones and meat of the cow effortlessly, and his hands were very neat. Liang was surprised and asked me enviously, "Why is your craft so high?" My master smiled and replied, "What's the fuss about?". I can do this because I am very familiar with the structure of beef bones and meat, so it is so easy. " Liang asked again, "So, this knife you made must be very sharp?" With a flick of a knife, my master easily told Liang Huiwang what it meant. He smiled and replied, "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 nine years and killed 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! "