使馆要求做毕业证和成绩单清华认证，要求做两份，一份直接由认证中心寄给使馆，一份由认证中心寄给我，再由我寄给使馆。不明白为什么要这样？两份是指一份认证，一份备份吗？
以下是使馆通知原文，请过来人帮忙，先谢过。
We require two original credentials reports. You must submit to us the original report you receive from CADGEDC, and arrange for CADGEDC to send a second report directly to our office in Hong Kong.
以下是使馆通知原文，请过来人帮忙，先谢过。
We require two original credentials reports. You must submit to us the original report you receive from CADGEDC, and arrange for CADGEDC to send a second report directly to our office in Hong Kong.
