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... ering engine, and the construction of the propulsion engine is also coming to an end.
12,000 underground cities around the world, all built under 12,000 planetary engines.
Each underground city has independent industrial systems, agricultural systems, water circulation systems, and atmospheric circulation systems, and the energy system relies on re-fusion planetary engines.
三十 After thirty years of population control, the current global population and the peak population of ...
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