...外层 电子少,易于脱落,而形成自由电 子(free electron)自由电子可以在 金属中移动而形成所谓的电子云 (cloud of electrons)。
双语例句
1
Then a strong current ofelectrons follows that path from the cloud to the ground, and it is that current that illuminates the channel as the lightning we see.
然后一股强大的电子电流沿着这条路径,从云层到达地面,正是这种电流像我们看到的闪电一样照亮了通道。
2
The formation of the channel is initiated when electrons surge from the cloud base toward the ground.
当电子从云层底部涌向地面时,通道就开始形成了。
3
The stream of positive particles that meets the surge ofelectrons from the cloud often arises from a tall pointed structure such as a metal flagpole or a tower.