求翻译： Traceability: Piece control and Lot control are both required, PCB-to-Material, Material-to-PCBs trace are both needed.是什么意思？

待解决

悬赏分：1 - 离问题结束还有

 Traceability: Piece control and Lot control are both required, PCB-to-Material, Material-to-PCBs trace are both needed.

问题补充：

匿名	2013-05-23 12:21:38 溯源：一块控制和很多控制都需要，都需要PCB的材料，材料的多氯联苯跟踪。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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