但是我们看到如果，我们有一个自由电子，就像虚线所示那样，那将会是一个较高的，不够稳定的能量。
But we see if we have a free electron, as we do in this dotted line here, that's going to be a higher energy that's less stable.
当导体的自由电子只以一个方向运动时，这样产生的电流叫做直流电，常缩写为。
When the free electrons in a conductor move in one direction only. The current thus established is called a direct current, which is often abbreviated to DC.
当建立起一个电场时，全部自由电子都会朝一个方向运动。
When an electric field is set up, all the free electrons will be made to move in one direction.
根据自由电子气模型给出了一个半定量的表达式解释了这一关系。
A half quantity explanation is proposed according to the one dimension free electron model theory.
自由电子的运动学由自由狄拉克方程——一个四维系统的偏微微分方程描述。
The kinematics of free electrons is described by the free Dirac equation, a four-dimensional system of partial differential equations.
自由电子的运动学由自由狄拉克方程——一个四维系统的偏微微分方程描述。
The kinematics of free electrons is described by the free Dirac equation, a four-dimensional system of partial differential equations.
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