求翻译：摘 要：介绍哈长线几年来采用数字式通用探伤仪进行钢轨焊缝探伤的方法，从探伤扫查、正常回波显示、缺陷回波显示、缺陷定位定量等4个方面详述了轨头、轨腰、轨底三个探伤区域的探伤方法，并介绍了轨颚伤损、轨底月牙形伤损、轨腰与轨底圆弧区斜向下伤损等特殊部位的探伤方法。实际探伤作业表明用数字式通用探伤仪进行钢轨焊缝探伤，能够有效地探伤扫查焊缝及热影响，弥补焊缝专用探伤仪存在盲区的不足。是什么意思？

Abstract: Ha long-term a few years to adopt digital general-purpose flaw detector rail weld inspection, scanning from the flaw, normal echo Echo, defect localization and quantification of four details the rail head, rail waist rail bottom three of the testing methods of flaw detection region, and ra

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Abstract: Introduced the Kazak long-line for several years use the digital general crack detector to carry on the rail welded joint crack detection the method, sweep from the crack detection look up, the normal echo demonstrated, the flaw echo demonstrated, the flaw

Summary: Describes HA long-term years used digital type General flaw detector for rail weld testing of method, from testing sweep check, and normal echo displayed, and defects echo displayed, and defects positioning quantitative, 4 a area detailing has rail head, and rail lumbar, and rail end three