Atwater and his colleagues have made prototypes of the design in the lab, and the product doesn't look like the typical solar panels you might see on top of a building.

VOA: standard.2010.02.19

If you scroll back up on the printout or screen here, you'll see that you can actually not only declare function's prototypes, their general structure.

如果我回滚到打印输出或者这个屏幕，你们将看到你们不仅可以声明函数的原型,它们的一般结构。

哈佛公开课 - 计算机科学课程节选

So clearly it's an old story and we have even older prototypes for elements of the story as well.

证明，这是一个古老的故事,我们甚至可以找到更古老的故事原型。

耶鲁公开课 - 旧约导论课程节选