求翻译：经了解，出货前通常采用目检方式，而“F21E”的插头手指上的孔只有0.25MM的小孔，小孔和手指镀层有破损目检不容易发现。QC检查方式存在漏洞。是什么意思？

Understood before shipment usually a visual inspection, the f21e plug fingers on the holes only 0.25mm holes, holes and finger coating the damaged visual inspection is not easy to find. qc way of checking loopholes.

It is understood that the former are typically used for visual inspection, and "F E 21 " plug on the finger holes of only 0.25 MM holes, small holes and coated with a broken finger visually is not easy to find. Check QC vulnerability exists.

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Upon request, usually by Visual inspection before shipment, and "F21E" plug finger holes on only 0.25MM small hole, small holes and finger coating is damaged Visual inspection is not easy to find. QC check for vulnerabilities in the way.

Front after the understanding, produces goods usually selects the visual inspection method, but “F21E” on the plug finger hole only then the 0.25MM eyelet, the eyelet and finger coating has the breakage visual inspection not not easily to discover.QC inspection way existence loophole.