Such electrons can move about and, if they all move in the same direction, create an electric current.
Such electrons can move about and, if they all move in the same direction, create an electric current.
这些电子可自由运动，一旦形成定向运动，即产生电流。
Such electrons can move about and, if they all move in the same direction, create an electric current.
这些电子可自由运动，一旦形成定向运动，即产生电流。