INTRO Computer cost and performance eventually reached the point where personal computing became viable.

简介 计算机的成本和性能最终达到了个人计算变得可行的地步。

This is the main reason why computers cost so much less today than they used to.

这就是今天计算机的成本比过去低得多的主要原因。

You can go buy an MP3 CD player, and an MP3 CD, which you can burn on your computer, costs about $150, but holds 150 songs.

你可以去买一个MP3 CD播放器，一张MP3 CD，你可以在你的电脑上刻录，价格大约是150美元，但是可以存150首歌曲。