he earth's Gregorian era,
The hostess Donna said: "May I ask Bertran, the time traveler, what was the earth's environment like in 4000 AD?
Bertran said slowly:
Thank you host,
On Earth I met many interstellar guides from parallel universes,
I was born in a space city in the orbit of Jupiter in the year 3923 of the earth's Gregorian calendar,
Space City is constructed by the Space Colony Company under the Cosmic Galactic Alien Group.
take advantage of free tracks,
Build a movable space city,
The space city consists of a pair of cylinders,
The inner wall of the space city has a natural environment suitable for plant growth.
There are roads, residential areas, commercial areas, working areas, etc. in the space city.
At one end of the space city is a solar power station,
At the other end is the hatch where the space shuttle or spacecraft is parked,
Bertran said slowly:
Every year from May to September on Earth,
I will lead a group every month,
Take the interstellar travel time machine under the cosmos galaxy alien group,
Traveling to