求翻译：由于昆山出口加工区是特殊的监管区域，大部分的进口货物必须从上海转关回昆山，在当地海关完成申报，这部分是客户自已找报关行完成的。是什么意思？

Because Kunshan export processing zone is a special regulation zone, most of the imported goods must transit from Shanghai back to Kunshan, completed in local customs declaration, this part of the customer the ability to find a customs broker is complete.