3 floors

• This image was provided by the original author. I just turned it into a 3D template, and it's not my original work.
• Interesting fact: Not all radiation is harmful to the human body! Cosmic radiation from the sun and outer space is a type of natural radiation, and we are constantly exposed to it every day. However, the Earth's atmosphere and geomagnetic field can effectively shield most of the cosmic radiation. In fact, we constantly consume trace amounts of natural radiation in our daily lives from rocks, soil, and even the food we eat.