Sorting technologies in postal services, including optical character recognition (OCR), video complement and address check via bar code have reached the world's top level.
邮政光学字符识别（OCR）、视频补码、码址校验等分拣技术处于世界领先水平。
There are three types of scanning devices: optical scanners, bar code readers, and char and mark recognition devices.
扫描设备有三种类型：光学扫描器，条码阅读器，和char和标记识别设备。
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