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nature : the natural world is a universal law -- in all types of changes, energy is not fabricated, it will not defeat itself, it will only transformed from one form to another form, and when the total energy conversion is constant. Thus, the principle of integrity to be called "energy conversion and conservation principles." For example, the mechanics of kinetic and potential energy into each other, electrochemical battery which occurred in the energy and chemical energy into each other, or actresses conservation.
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