Due to ground pollution, my understanding of the dense forests is limited to concepts.
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The environment here resembles the era of dinosaurs, particularly the Cretaceous period, as shown to audiences through holography in classrooms or museums. In this oxygen-rich environment, animals, plants, and even insects grow to enormous sizes.
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In the past, the average person's concept of the inner world was mostly thought to be a journey from the Paleolithic age to the peak of technological explosion, where early humans, forced by the dangers of the surface, reluctantly descended underground to live. This urban legend, which had endured for centuries, unfortunately became a reality one day, or perhaps it is simply an inevitable law that repeats itself on Earth.
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Moreover, the mysterious underground civilizations have become synonymous with advanced technology.
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This mystery is akin to the extraordinary characteristics of the Pyramid, Stonehenge, and the Sphinx, all of which are believed to be part of a history influenced by extraterrestrial civilizations.