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| 1. | Some electrons, called free electrons, are free to move from atom to atom within a conductor . |
| 有些电子，被称为自由电子，能在导体内自由地从一个原子游离到另一个原子。 |
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| 2. | be supplied by the generator to battery in order to overcome the opposition is transformed into heat within |
| 发电机或电池克服电阻所必须发出的能量在导体内转变成热。 |
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