Time Travel: Advanced Trading at the Beginning

Lu Yang gained the ability to travel back and forth across the wandering earth, and also received a portable space. A wandering planet in the universe. What supplies are in short supply? Rice, noodles, vegetables and grains! A box of cheap canned beef can be exchanged for hundreds of high-end CNC machine tools and technology. Whatever the country lacks, we have it. Advanced nuclear submarines and aircraft carriers? It's okay, let people dig in the ice, pay more for food and canned meat... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.