The scientific and technological level of the three-body people is higher than that of the earth people, but the living environment of the three-body people is very bad. Their home star has three stars, and their trajectory cannot be determined. When three stars approach, the surface temperature can reach thousands of degrees Celsius, enough to kill all life. When the stars are far away, the surface temperature will drop to several hundred degrees below zero.
In order to adapt to this harsh living environment, the three evolved a "dehydration" similar to hibernation. In the dehydrated state, 90% of the water in the human body is removed, as thin as a piece of paper, and can be recovered by soaking in water when there is water.