Hospital X-ray machines work by passing an X-ray pulse through a body onto radiographic film.
医院的X光机工作原理是X光射线脉冲穿过人体在射线胶片上感光成像。
3
What makes this one -- dubbed SN 1979C -- special is that it has been observed over the years with a series of orbiting x-ray telescopes, most lately the Chandra X-Ray Observatory.