As far as computer operating systems go, Microsoft is king.

一谈到电脑操作系统，我们都会认为微软是王者。

youdao

Applications software is distinguished from computer operating systems.

应用软件不同于计算机操作系统。

youdao

Most computer operating systems and software in Swahili-speaking areas are in English or French.

BBC: Word processing in Swahili

Already advanced speech recognition systems can be found in smartphones and most modern computer operating systems.

BBC: Why do we all use Qwerty keyboards?

Computer operating systems make more money from users than from software developers.

ECONOMIST: Economics focus