First of all, I choose to bring an encyclopedia on how to make matches and how to purify sea salt. Then I want to bring a cookbook, mainly based on Sichuan-Chongqing Hunan cuisine. I think if I go to ancient times, I will definitely not get used to the environment there, and the taste of food is really different from now. Finally, I want to bring a lot of hybrid rice seeds. In ancient times, there was a shortage of grain and the yield of rice was very low. Hybrid rice can provide me with a good market and become a person who changes the times.