然而，因为思想的拘限性使我们很少体验到幸福真正的本质，很少能把它与我们的心灵相联系，心灵的影子就像隐藏在太阳背后的云彩。

However, we seldom experience our true nature and seldom get in touch with our souls because the limitations of thought shadow the soul the way clouds hide the sun.

youdao

这件太阳裙背后有根灵巧的拉链。

The sundress has a neat back zipper fastening.

《柯林斯英汉双解大词典》

当时太阳在他们的背后，宇航员能够清楚的看到这个蓝色的星球。

With the sun at their backs, the crew had a perfectly lit view of the blue planet.

youdao

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