Apple's iPhone 5 may have sold millions, but it does have its share of flaws. One that has drawn a lot of attention is the so-called "purple haze" seen in photos when a bright light source is just out ...
Xuan paper, known as one of the Four Treasures of the Study, is an important carrier for traditional Chinese calligraphy and painting art, and it is also a precious cultural heritage of the Chinese ...
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