Luo Tiancheng traveled to the end of Qin Dynasty. On September 1st BC, the weather was not good. It was raining and humid. It symbolized a past era and an era that was about to begin. (This may be a manual that traveled to the end of Qin Dynasty. There is a complete set of industrial systems, another set of industrial systems for research, and a set of the most advanced products in the world for research. It is a manual to complete from scratch to the present in the shortest time.)
