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1·I knew both of these men personally and I believe it to be an authentic document.

我认识这两个人，我相信这是真实的文件。

2·The inaugural committee confirmed the document was authentic, but said it was subject to change. The document was first reported by the Center for Public Integrity.

廉政中心最先公布了这份文件。就职典礼委员会确认该文件属实，但表示可能会有变化。

3·Is this document authentic?

这是一份真的文件吗？