As the century came to a close, photo IDs were nearly universal in America, with most people carrying several.
到了上个世纪末，照片身份证在美国已几乎普及，大多数人都随身带有几张。
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Recently, it is universal to apply TiO2 photocatalytic technology for the decomposition of volatile organic compounds. This technology is photo-stability, easy operation and low cost.