1 has different meanings. Cheats are rare books or books that ordinary people can't understand. The secret is a secret collection of ancient books, which means "books that can't be told to others".

2. Different sources. The secretary is from Jin's "Praise of Paintings in the Old Taichang Mansion": "Manage the secretary and argue the old history." The secret has no source. The usage of cheats is basically the same as that of "cheats".

3. The emphasis is different. The secret book is the embodiment of ancient mysterious things in China. Ancient emperors wanted to live forever, and some charlatans tried their best to refine Dan medicine, calling the formula of refining Dan medicine "secret recipe", which means "a book that can't be told to others". It is a way of inheritance. Secret is different from other public information objects, and it has certain non-publicity and practical value. It is an important method and trick to do one thing.

4. The usage of quotations is different. Cheats: Gong Zizhen's "Little Wandering Fairy": "Who cited the ninth stream in the cheats and pulled it out from the pillow in the Di Hong series." Secret: Duan Zhuan, a Book of the New Tang Dynasty: "It's a lot of tricks to learn and recite it."