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... thin this depth range, cosmic rays can be well isolated. Under the temperature control measures provided by controlled nuclear fusion, the energy required to maintain the temperature inside the pit can be reduced. Consuming.
Because it is inside a hard rock layer, the entire underground city is completely closed except for a few artificial vents.
If gravity is not taken into consideration, it is not much different from the urban life on earth.
Drinking water, oxygen, and foo ...
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