First, PC operating systems were designed to free computer users from the tyranny of centrally controlled mainframes.

首先，PC操作系统被设计为将用户从主机集中控制的专治统治中解放出来。

youdao

Many specific mobile platforms have free SDKs available that include device emulators that run on a PC desktop.

很多特定的移动平台提供了免费的SDK，包括可运行在PC桌面上的设备模拟程序。

youdao

You might want to install one or more free utilities that will speed up and tweak your PC.

你可能想要重新安装一个或者更多的免费工具来提高你电脑运行的速度，使你的电脑运行速度加快。

youdao

It's a little more involved on a PC but it's all free, the software you can download, and Linux in similar operating systems generally come with a compiler or you run a simple command to get it.

在PC机上有点复杂，但是它是免费的，你一般下载的软件，类似Linux的操作系统等等通常都需要,一个编译器，或者你可以运行一些简单的指令来获取。

哈佛公开课 - 计算机科学课程节选

The base unit includes a CD player and 40GB hard drive, along with embedded Gracenote software, so that CDs can be ripped PC-free with song data included.

ENGADGET: Philips Streamium WACS700/05 wireless music system reviewed

Hard to imagine Xbox 360 doing for PC-free online movie downloads what all the other companies couldn't or haven't (we're looking at you TiVo, Netflix, iTV, etc.), but then again Microsoft did start up with that Xbox Live music video download thing last year.

ENGADGET: Xbox Live to offer HD movie downloads?

Bradshaw said EA would give players a free PC game to compensate for the hassles.

NPR: EA Apologizes For 'SimCity' Launch Woes