The tube consists of a light-sensitivecathode that emits electrons in proportion to the photons striking it.
光电倍增管有一个对光敏感的阴极，它发射的电子数目与撞击到其上面的光子数量成正比。
2
The part of a television transmitting apparatus that receives the primary image on a light-sensitivecathode tube and transforms it into electrical impulses.