And a lot of it is done with real objects, but there's also animated versions so here is an animated example.

大部分实验启用了实物,但也有些动画视频,这就是个动画的例子

耶鲁公开课 - 心理学导论课程节选

When the Euro force came out, it was a bit above a dollar then it fell to something like 70 cents I think down.

当初欧元刚开始启用时，稍高于美元,之后，貌似下跌了70欧分。

斯坦福公开课 - 经济学课程节选