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You can ride around traffic jams and present filling stations the cold shoulder when you ride an electric power assist bicycle to be effective after which pedal home for exercise. To charge a power assist bicycle cost about ten cents. That charge is going to take you as much as 20 miles. That's like paying ten cents per gallon for gas. If we ever have gas shortages, such as the seventies throughout the Arab oil embargo, your power assist bicycle will give you the best way to get around.
Generally speaking, the invention of technology is the materialization of scientific knowledge and experiential knowledge, so that the theory and knowledge which can be applied can be realized. The development of modern technology and the guidance of scientific theory have become the "application of science" to a great extent. However, the development of modern science is also inseparable from technology, which often becomes the aim of scientific research, and the development of technology provides the necessary technical means for scientific research. There is a relationship between them, mutual promotion and mutual restraint. Predictably, their connections will become more intimate and boundaries will blur
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