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。

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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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