Suddenly traveled to ancient times, what should I do if I don’t have enough to eat? What, men are about to be beaten, the government has given a beautiful wife, and they must have children next year? What, foreigners are coming to invade the Central Plains again?... It doesn’t matter, learn mathematics, physics and chemistry well, and go The whole world is not afraid! The prairie cavalry is unstoppable? The Japanese pirate ships are indestructible? What a joke!