电(Electricity)

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[关键词]英语六级作文  

      life would be like without them. when there is a power failure, people grope about in flickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.  yet, people began to understand how electricity works only a little more than two centuries ago. nature has apparently been experimenting in this field for millio..

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