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1. The proofing machine is used to check the accuracy of printed documents.
校对机用于检查印刷文件的准确性。
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2. The proofer uses a laser beam to verify the quality of the printed material.
校核机使用激光光束来验证印刷材料的质量。
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3. The validator checks the authenticity of the signatures on the documents.
校验器检查文件上签名的真实性。