back ray tracing 反向射线追踪
back reflection X-ray camera 背面反射X射线照相机
back-reflection x-ray exami 背面反射
He had two X-ray burns on the back.
他背上有两处地方被X射线灼伤。
Right now, the test involves lying on your back while the arm of a special X-ray device moves over your body to measure the thickness of various bones.
现在，这项检测需要你躺下，同时一个特别的如手臂一样的X光射线装置来回在你身体上移动来检测不同部位骨头的厚度。
I can't see how we'll ever retreat back to technologies that alienate us, just like we won't go back to buying cars that break down a lot or cathode ray tube TVs.
我认为我们不可能回到让人感到疏离的技术上去，就像我们不会再去买常常坏掉的车或者阴极射线管的电视机一样。
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