Many small worlds surrounding the big world, like satellites, are just a few mountains, plus a few lakes, with a radius of no more than a hundred miles. It is unlikely that there will be an overly complicated chain of biological evolution.

But there are often aboriginal people in it, which is really baffling.

The first explanation is human history, which is more profound than imagined. Mulberry leaves grow silently, thousands of years, let the footsteps of human beings spread all over the small world.

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