From the beginning of the book on May 11 last year to the end today, it took a total of 19 months, 2.46 million words, and an average of 4,500 words per day. It can be regarded as the slowest book written by Chengzi. However, the book is finally finished. Some students feel that it is unfinished. In fact, all the stories that should be told have been told and the pitfalls have been almost filled. It is indeed the end. The book "Material Empire" was opened a little hastily. So I chose the subject of materials, partly because I regretted that Mr. Freeze¡¯s masterpiece "Material is King" could not be written. I always wanted to have the feeling of continuing the story, so I chose this topic on impulse, but I didn¡¯t expect it to be a big pitfall. First of all, the field of materials is too broad, including metallic materials, organic materials, inorganic non-metallic materials, and functional materials. Each of them can be written in a book or even several books. If someone writes about the ceramic empire or the superconducting empire in the future, everyone will Don't be surprised, because the story here is enough to support a book. I set the topic to this level from the beginning, and it was a trap. Secondly, Orange is a liberal arts student, Orange is a liberal arts student, Orange is a liberal arts student Write about quenching and normalizing, and I can barely understand it, what metal prices, what bonds, what chains and other things, Immediately confused. If you don't understand the mystery, you can't write the story, so the further you go, the harder it becomes. I was planning to write about memory alloys, carbon fiber, photovoltaic materials, etc., but I felt that writing something like this behind closed doors was too low-key, so I simply gave up. "Compared with Industrial Overlord, Material Empire has better results. When it was completed, it had an average of 8,000 orders. It was considered a relatively good book at the beginning. But, in my heart, I prefer industrial overlords. The industrial overlord does not have the material empire to write as "cool", but it has feelings. As we all know, Chengzi has always been a sentimental person Can you imagine Chengzi's cute expression? No matter what, when the book comes to an end, it ends. Thank you to the editors Yuanzheng Dada, Xiaomi Sister, Yisuo Dada, and Anyi Dada who have always cared about this book; thank you to all the readers who have never given up on this book and have always subscribed, rewarded, recommended and voted for it; thank you to all those who care about Chengzi. friends. The physical book of this book is being published, and the first two volumes are already on the market. You can see it in various online bookstores. You are welcome to buy it, and I hope you can recommend it to your relatives and friends. The sales of physical books are booming, which is also an encouragement to Chengzi. Thank you Chengzi. The rest is about the new book that many friends are concerned about. After writing Empire of Materials, Chengzi does not plan to write about industrial themes immediately. He initially plans to write a book about ordinary urban themes as a transition. If all goes well, the new book is expected to be uploaded early next month. I hope everyone can support it as always. I wish all book friends a Merry Christmas and a Happy New Year in advance. Let's meet again after New Year's Day. (To be continued.)