模具钢D2/1.2379的技术条款请帮忙翻译？

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下面一段是客户发过来的D2/1.2379的技术条款，涉及到相关术语，新人不懂，所以求高手帮忙翻译下，万分感谢!
Material shall be rejected when single indications are greater than standard or continuous indications are greater than75% of standard. Standard shall be 0.120 inches(3.0mm) flat bottom hole. Single clusters of indications are accepted when there are maximum six(6) clusters per 36 inches length(a cluster consists of six(6) indications of less than 0.120 inches(3.0mm) encompassed by a circle of 2 inches(50.8)mm radius.  Indications of less than 0.80 inches(2.0mm) are not counted. Reduction of bottom echo more than 50% is cause for rejection.