A powerful electric current is passed through a piece of graphite.給一塊石墨通入強(qiáng)電流。Electric current is often powerful enough to kill a man.電流常強(qiáng)得足以致命.This engine puts out more electric current than the other one.這臺(tái)發(fā)電機(jī)比另一臺(tái)發(fā)的電多....