You don't need a light switch or a light bulb or an iPhone app to turn something on or off.

你不需要一个电灯开关,或者一个电管,或者打开关闭一个iPhone应用程序。

哈佛公开课 - 计算机科学课程节选

When the gentleman brought it and install it in my bedroom here, they gave me one simple sheet to tell me how to turn it on, how to get into the program, and then program really explain itself, really invites you to explore the pieces of it, by itself, I mean.

当他们把电脑带来,安装在我的房间里，给了一个简单的小册子,告诉我如何打开电脑，如何运行这个程序，然后程序就自动开始解释了，它让你去探索每个部分，自动的，我是说。

麻省理工公开课 - 媒体、教育、市场课程节选