你的背还疼吗?
Turn around and let me look at your back.
转过身去让我看看你的后背。
It's all over your back, dude.
它全在你背上,老兄。
The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face.
VOA: special.2009.12.13
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。
To survive in New York City, the most important thing is to watch your back always.
生存在纽约这个城市,最重要的事情就是时刻保持小心。
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