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... requires thermal energy.

Throw out all kinds of heat-generating mechanical instruments of the pre-civilization. The most primitive way also requires a pile of combustibles, and then a fire is made. The combustibles are used to keep the fire burning, and the pot of water is used to boil the water.

This is a transformation of energy.

In this, the heat of the fire inevitably spills around, so it takes time to boil a pot of water, instead of the heat of the fire instantly reach ...

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