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The concept of saving energy is presented in a simple way, and the other term of energy conservation is to cherish electricity. The meaning of the hourglass means to cherish the time, so drain bottle into a hourglass shape of electricity, and turn the meaning of cherishing the time into treasuring electricity. The framework of the hourglass is enlarged to present the focus, as the sand goes by; it is on behalf of the loss of electricity, thus to express the preciousness of conserving electricity.
China University of Technology