Unfortunately, because these materials are not good conductors of electric charge, it takes a long time to get the charge in or out of a battery.
不幸的是，因为这些阴极材料都不是良导体，所以充放电需要很长时间。
According to their ability to conduct electric current, all materials may he classified into three main types: conductors, semiconductors and insulators.
根据导电性能的不同，所有的材料可分为三大类：导体、半导体和绝缘休。
According to their ability to conduct electric current, all materials may he classified into three main types: conductors, semiconductors and insulators.
根据导电性能的不同，所有的材料可分为三大类：导体、半导体和绝缘休。
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