How Can We Trigger the Doomsday Line When We Are Obviously Working on Primitive Infrastructure?

No cp, the heroine has no other golden fingers except the knowledge base, and it has developed since the Stone Age When he opened his eyes, Shi Qian came from the laboratory to the body of a dying little girl from the tribe. She doesn't know how to use force and has lost her memory about the laboratory, but she retains a head full of modern scientific knowledge. Faced with the crisis of the tribe being on the verge of extinction, she relied on her knowledge to make fire and purify water, farm the land to refine medicine, build weapons, and spread knowledge... She led her people to rise from the crisis of survival, gradually established farming, medical, cultural and military systems, and ushered in the dawn of civilization. And she herself, in the process of building a civilization from scratch, also learned who she was.