求翻译：在监理单位、总包单位现场见证取样下送钢筋到生产厂家进行鉴定，对钢筋来源及供应商、经销商之间的结构关系进行追溯。是什么意思？

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The control units, total package on-site witness sampling units under the steel manufacturers to identify sources of reinforcement and suppliers, distributors for the structural relationship between retrospective.

In the overseeing unit, always wraps under the unit scene testimony sample to deliver the steel bar to carry on the appraisal to the manufacturer, to between the steel bar origin and the supplier, dealer's structure relations carries on the backward.

Supervision units, General Contracting unit at the scene witnessed sent reinforcement under sampling to identify the manufacturer, steel structural relationship between the sources and suppliers, dealers back.