I ask you to build tractors, but you build rockets?

I went to the plateau yesterday and had a headache, so I asked for leave temporarily.

PS: I thought I would be free after the defense, but I wasn't... I will be unable to update for a long time due to work in another place at the end of the month. This book will be completed with about 50,000 to 80,000 words of follow-up content this month. The content that has not been taken care of will be gradually updated in the form of extra chapters in the future. Thank you for your company and support (of course, the editor's concern).

PS: The next book is also being raised, but it may take several months.