因为这些文件经过了多年的积累，很多相关人员都在上面签字，几乎不可能被复制。
Because documents are collected over several years and signed by many people, they are virtually impossible to replicate.
因为这些文件经过了多年的积累，很多相关人员都在上面签字，几乎不可能被复制。
Because documents are collected over several years and signed by many people, they are virtually impossible to replicate.
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