Is Li Yongle 660 two copies?

Li Yongle 660 is not two books. Li Yongle 660 refers to different versions of the same book "660 Cases in Li Yongle". Among them, "first order" refers to the first edition, namely "660 cases of Li Yongle (first order)"; "Second order" refers to the second edition, namely "660 cases in Li Yongle (second order)". Li Yongle's 660 Cases is a book about physics knowledge and problem-solving skills, which is widely regarded as a good helper in physics learning. The first edition was published in 2004 and the second edition was published in 2006. There are some differences and updates between the two versions.