What does "sheep intestine path" mean?

Sheep intestine means: the intestines of sheep are particularly long, thin and winding. Later, it was often used to describe rugged mountain roads, referring to winding and extremely narrow roads, as well as narrow, cold and steep roads. Later, it generally refers to people who are narrow-minded.

The Chinese use "sheep intestines" as a metaphor for the trail is also based on their understanding of "sheep intestines". According to the anatomy, it is known that the sheep intestine has the characteristics of one thin and two long, and is very tortuous. Stretch it to a length equivalent to 40 times its body length. The small intestine plus colon is more than 30 meters long. The intestines of cows are thicker and straighter, with a length equivalent to 20 times the body length; the intestines of horses are straighter, with a length only several times the body length. The diameter of sheep intestine is only 1/4 times that of the intestines of cattle, horses and other animals, making it appear very narrow in comparison. Because the intestine is winding and slender, it is most appropriate to use it to describe the narrow, winding and steep road.