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With the science and technology were developing, oil could be
empty in future. People started to us electricity to replace oil.
The density of population was raising and the free space in city
were decreasing. People growing emphasis on environmental
protection and start to ride electric bicycle for commuting.
The weight of electric bicycle were made more light. It also can
be folded and easy to carry on public transportations. Another benefit is that it was easy to park in the crowded city.
Nation Yunlin University