I suddenly traveled to ancient times, and I didn’t have enough to eat, what should I do? What, the men are about to be beaten up, and the government has given a beautiful wife, who must have a baby 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 world is not afraid! The grassland cavalry is unstoppable? The Japanese pirates' big ship is indestructible? A joke!