after the acceptance by the customs, goods declaration and the relevant documents as well as their contents are not allowed to be withdrawn or amended unless the reason is deemed valid and approved by the customs.货物的申报和相关文件及其内容一旦被海关受理就不得撤消或者变更,除非理由充分并被海关认可.这里的contents应该看做是the relevant documents的内容.当然是文件的内容了
