Swings work by converting potential energy into kinetic energy, then kinetic energy back into potential energy, over and over again.

秋千的晃动是通过势能与动能的不停转换实现的。势能转换成动能，动能再转换成势能，如此循环。

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And that's potential energy that goes into the spring.

这是存进弹簧的能量。

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They could be lightweight, could be molded into any shape, have the potential to store more energy than conventional batteries and could be safer and cheaper to produce.

它们非常轻便，可以被制成任何模样，比传统电池具有潜力储备更多的能力，而且更加安全，制造廉价。

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By embedding energy-storage materials into existing structures, this sheet technology would allow for ubiquitous storage and delivery of electric power and potential integration of clean energy into nearly every corner of our daily lives.

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This translates into big market potential for competitive U.S. energy technology companies.

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In conventional electricity generation, roughly one third or so of the energy potential contained in the fuel is converted into electricity.

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