Xuefu Wuche refers to the zodiac rat, because the mouse often gnaws books, eats more books, naturally learns more, reads thousands of books and travels thousands of miles, so Xuefu Wuche is a rat for a lifetime.
The allusion of the five chariots of learning is in the "Zhuangzi Tianxia Chapter", which mentions a man named Hui Shi, who was very knowledgeable and well-written, and his knowledge was so rich that he could use five chariots to fit. This allusion later evolved into the idiom "learning rich five cars", which is used to describe those who are knowledgeable.
During Hui Shi's time, he used his knowledge to serve the country, discussing state affairs with King Wei Hui, the monarch of Wei. He was very knowledgeable, and King Wei Hui admired him very much. However, although Hui Shi is rich in learning, he has a withdrawn personality and likes to debate, often arguing with others about small things. He did not have many friends, and his political views did not enjoy widespread support.
In addition, the allusion to "learning the rich five chariots" is also related to other passages in the Zhuangzi. For example, in the Zhuangzi Tiandao, it is mentioned that "Huizi is good at argumentation", and Hui Shi is good at debating, but his arguments often lack logic and rationality, just to show off his knowledge. It also reflects a cultural phenomenon of the era, where some scholars debated in order to show off their knowledge, rather than to solve practical problems.