Fiber Optics cathode ray Tube?

光纤阴极射线管FOT ？

And if I evacuate it, I have a cathode ray tube.

如果我对其抽真空，我会得到一根阴极射线管。

A display device that USES a cathode ray tube.

一种使用阴极射线管的显示装置。

A cathode ray tube is shaped like a large bell.

阴极射线管的形状象个大铃铛。

The so-called visual display unit is in fact a cathode ray tube.

所谓可见显示装置实际上是一个阴极射线管。