There is a lot of mature experience in the exploration of real dreams. Although the real dream environment will change a lot every time, there are also many basic physical principles that do not change much. Therefore, after trained explorers made stone tools, the first thing they did was to make clothes, and the second thing was to make iron. Clothes are very important in real dreams. Sometimes the rules change. Some extremely tiny insects here will suddenly produce highly toxic substances, or generate some kind of virus or disease that is difficult for humans to resist.

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