医生让他先拍一张X光片。
相反的是，用户依赖于反射光，就像他正在读一张正常打印出来的文章一样。
Instead, the user relies on reflected light, as he would if he were reading a sheet of printed paper.
曾经有一个男子请求我为他和他临终的父亲拍一张合影，我利用自然光为他们拍了照。
Once a man asked to have his photo with his dying father, and I photographed them in natural light.
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