Inside the glass vacuum tubes, electrons were fired at a screen covered in red, green, and blue phosphors, a type of material that glows when hit by something like electrons.

在玻璃真空管内，电子被发射到覆盖着红色、绿色和蓝色荧光粉的屏幕上， 这种材料在被电子之类的东西击中时会发光。