He left the room and returned with a handful of iPod models, 他走出房间，然后拿来一堆iPod的模型，

all of which had the same device on the front: the soon-to-be-famous trackwheel. 它们的正面都有一个相同的装置，也就是后来著名的转盘追踪设计。

"I had been thinking of how you go through a playlist," he recalled. 他回忆道：“我一直在想怎么浏览播放列表。

"You can't press a button hundreds of times. Wouldn't it be great if you could have a wheel?" 你不可能按几百次按钮。如果有个转盘岂不是很好？”

By turning the wheel with your thumb, you could scroll through songs. 通过大拇指旋转转盘，你可以滚动所有的歌曲。

The longer you kept turning, the faster the scrolling got, so you could zip through hundreds easily. 而且你转的时间越长，列表下拉的速度就越快，所以你可以很容易地浏览几百首歌。

Jobs shouted, "That's it!" He got Fadell and the engineers working on it. 乔布斯大叫：“就这个！”他让法德尔和工程师们按照这个构思开工。

Once the project was launched, Jobs immersed himself in it daily. 自从项目开始，乔布斯每天都投入其中。

His main demand was "Simplify!" 他最主要的要求就是“简化！”