We were on the roof of America and all we could do was yell I guess across the night, eastward over the plains where somewhere an old man with white hair was probably walking towards us with the word and would arrive any minute and make us silent.

我们在美国的最高处大声叫喊,我想整个夜晚，在东部平原,随时可能有一个白发老人,向我们走来,让我们安静。

耶鲁公开课 - 1945年后的美国小说课程节选

Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

这是一个雨量测量器，安装在一个楼房的,屋顶上，当水流入到这个测量器，它就给计算机的逻辑部件发送一个信号，计算机立即通知内存条,为下雨天找出相应的指令。

哈佛公开课 - 计算机科学课程节选