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... rces harnessed by mankind.
People only need to utilize the drop in water levels to obtain strong and continuous power, replacing some tedious and repetitive labor.
Among the devices that use hydropower, the most typical are the water wheel for irrigation, the water mill for grinding grains, and the water beetle for crushing various things.
Of course, although these devices have relatively simple structures, they require high standards for tool making and woodworking skill ...
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