The use of DC electricity is another source of static electric fields, e.g. rail systems using DC, and televisions and computer screens with cathoderaytubes.
使用直流电是产生静电磁场的另一个原因，例如铁路系统使用直流电，电视和计算机屏幕带有阴极放射管。
2
A big problem was that both TCL and Thomson focused on clunky old models made using cathode-raytubes.
一个大的问题是TCL和汤姆逊二者都是擅长制造使用CRT(阴极射线管)的笨重的老机型。
3
CathodeRayTubes are not preferred by modern consumers, despite excellent picture quality, because they necessarily huge, bulky, and heavy.