太空站背后是地球地平线。照片由在发现号航天飞机任务STS - 128上漂行的约瑟·赫尔南德斯推出。

The Space Station with the Earth's horizon behind it. Picture tweeted by Jose Hernandez, who flew on the Shuttle Discovery mission sts-128.

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骆驼消失在沙丘背后，留给我的只有这一张照片，以及对索科特拉充满敬畏的记忆。

It vanished behind the dunes, leaving me with this picture and the most awe-inspiring memories of Socotra.

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在第一张照片中，她面对镜头，手放在背后。

In the first shot, she is seen facing the camera with her arms behind her back.

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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