The reason is that their valence band is full of electrons, which obstructs current flow.
The reason is that their valence band is full of electrons, which obstructs current flow.
因为它们的价带填满了电子，使电流无法流动。
The reason is that their valence band is full of electrons, which obstructs current flow.
因为它们的价带填满了电子，使电流无法流动。