Without the shadow mask it is not possible to project a color image on the screen. 如果沒(méi)有彩色顯象管陰罩，它對工程不可能在螢幕上的一幅顏色圖像。
As the electron beam goes across the face of the picture tube, there are various little spots of light and dark. 當電子束掃過(guò)顯象管屏幕時(shí)，屏幕上就有許多小亮點(diǎn)和暗點(diǎn)。
The limitations of this scheme became quite apparent with the introduction of detectors such as the plumbicon, image orthicon and vidicon. 這個(gè)方法的局限性在引進(jìn)諸如氧化鉛光導管攝像管，超正析象和光導攝像管之類(lèi)的探測器之后變得很明顯。
