With shadow puppets, the puppeteer stands behind a white cloth surface and rests the slightly see-through puppets against the cloth.

VOA: special.2009.09.23

The way he described is when you try to get down a quantum dimensions and you are standing there with your camera, just remember the sun is at your back and your shadow is always in the picture.

这种方法被他描述为,当你试着处理一个量子尺寸时,并且你试着拿着你的相机在那，记住太阳在你的背后,而你的影子总是在照片上。

麻省理工公开课 - 固态化学导论课程节选

And that's fine, because inside of curly braces can you redeclare variables with the same name if you intend to quote unquote shadow the previous variable.

那是可以的，因为,在花括号里面，你可以重新定义一个,相同名字的变量,如果你想引用之前的变量。

哈佛公开课 - 计算机科学课程节选