当把导线快速地(通过)来回弯曲折断时，部分功就转换成热，所以导线变热。
When a wire is broken by bending it back and forth rapidly, some of the work is transformed into heat and the wire gets hot.
当把导线快速地(通过)来回弯曲折断时，部分功就转换成热，所以导线变热。
When a wire is broken by bending it back and forth rapidly, some of the work is transformed into heat and the wire gets hot.
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