以下为句子列表：
英文: Lightning, form of visible electric discharge between rain clouds or between a rain cloud and the earth[1] .
中文: 闪电是一种可见的放电形式，产生于雷雨云之间或者是雷雨云和地面之间。
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英文: Model DK7720A is a special electric discharge wire cut machine,which is mainly used for machining magnetic material as well as mading exactitude mould and parts of other metal material. features electro-mechanical integration,and hegh machining efficiency
中文: DK7720型专用电火花线切割机主要用于加工磁性材料，也可用于加工精密模具及其它金属材料零件，具有机电一体化，加工效率高行装特点。
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