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Aquifers are underground layers of permeable rock, sand, or gravel that contain and transmit groundwater. They play an important role in natural water storage and are increasingly studied as a potential medium for energy storage in modern energy systems. In the context of energy storage, aquifers are used in seasonal thermal energy storage technologies, where _______ ________ ______ _____ _______ ____ _____ _____ _________ _________ _______.
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