1. Furthermore, each X-ray exposes a person to potentially harmful radiation, although, today's minute doses are almost completely safe. 
   而且，每一x射线都将人体暴露在具有潜在危害的辐射中，尽管今天的微小剂量几乎是十分安全的。
2. Gamma-ray observations help astronomers understand the basic physics of these sources by measuring the energy and variability of the highest energy radiation coming from these sources, radiation often comes directly from the central engine. 
   通过对这些辐射源的高能辐射变化及能量的测量，γ射线的观察有助于天文学家了解这些通常直接来自能量中心的辐射源的基本物理性质。
3. Of or relating to the range of invisible radiation wavelengths from about4 nanometers, on the border of the x-ray region, to about380 nanometers, just beyond the violet in the visible spectrum. 
   紫外光的，紫外线的刚刚超过可见紫光并在x射线区域边上，从大约4毫微米到380毫微米之间的不可视辐射波长的或与之有关的
4. cyclotron radiation and synchrotron radiation 
   回旋加速器辐射和同步加速器辐射
5. thermal radiation and nonthermal radiation 
   热辐射和非热辐射

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