What is the alien world like?

Alien's architectural style is very modern, unconventional, in line with the comfort of life, go out to take a flying saucer, no rear-end collision, no traffic jam. Because he is 1.50 meters tall, he eats little but fine, and wears shiny invisibility cloaks. Good at swimming, diving can reach 1.5 hours, and you can win the championship in the Earth Olympic Games.

Now people on earth welcome aliens, and the United States and France have also established alien reception stations. But coming here will have an impact on the earth's economy:

After foreign friends visit the earth, the economy on the earth will be impacted, especially in the aviation, railway, shipbuilding and automobile industries, because UFO technology is popular and the price is cheap. Then the oil industry closed down and the foreign star energy patent became a monopoly enterprise. The alien dishes in major supermarkets are welcomed by the people, which are good for health, and the vegetables on the earth are cold. People rushed to buy alien drugs, and many cancer patients and AIDS patients miraculously recovered; Aliens' orders for interstellar laser cannons have made aliens rich again. Commanders around the world scoffed at tanks, submarines and nuclear weapons, and stepped up training for space forces to deploy interstellar laser cannons. This kind of gun can destroy an asteroid every time it is fired. In the fifth year after that, the introduction of green exotic plants turned the desert into an oasis. Everyone moved to the desert.