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... to admire, but it is not impossible to observe the daily changes of day and night.
During the day, the light and heat emitted by the special mineral veins on the top of the cave will be stronger.
It will be relatively weak at night.
The soldiers of Xu Country use this simple and crude method to distinguish the day and night of the underground world, and adjust their working hours to ensure that their working and resting hours underground will not change.
Around noon, ...
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