Why was Du Yu, Minister of the Western Jin Dynasty obsessed with Zuo Zhuan?

Du Yu, Minister of the Western Jin Dynasty, was born in Jingzhao Ling Du (now southeast of Xi, Shaanxi). Sima Yi's husband. Dai Wei is the general of Zhennan, in charge of Jingzhou military affairs. After Yang Hucheng, he actively planned to destroy Wu. After the reunification of the country, he built water conservancy projects in Jiangnan, benefiting more than 10,000 hectares of public and private fields. He is widely read and has written in economy, politics, military affairs, calendar, law, arithmetic and engineering, so he is called "Du Wuku". Among the classics, I especially like Zuo Zhuan in the Spring and Autumn Period. Among the ministers, Wang Ji loves horses and is more than famous for collecting money. Du Yu sneered: "Ji Wang is addicted to horses, so why are you addicted to money?" Sima Yan, Emperor Wu of Jin Dynasty, asked Du Yu, "What's your hobby?" Du Yu replied: "I have a hobby of Zuo Zhuan." He is the first annotated edition of Zuo Zhuan, with 30 volumes of annotations of Zuo Zhuan in the Spring and Autumn Period.