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An attractive bomb, ‘electric scooter’
Don’t you often see people riding electric scooters at school or on the str...
양길웅  |  2023-03-02 01:24
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Hydrogen energy, promising energy resource leading the future
Global warming due to the use of fossil fuels such as oil, coal, and natura...
양길웅  |  2022-12-01 15:58
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